M54HC221/221A

M74HC221/221A

DUAL MONOSTABLE MULTIVIBRATOR

. HIGH SPEED

. tPD = 25 ns (TYP) at VCC = 5V

LOW POWER DISSIPATION
STANDBY STATE ICC=4 µA (MAX.) AT TA=25°C

. ACTIVE STATE ICC = 700 µA (MAX.) AT VCC=5V

HIGH NOISE IMMUNITY

. VNIH = VNIL = 28 % VCC (MIN.)

OUTPUT DRIVE CAPABILITY
B1R
(Plastic Package)
F1R
(Ceramic Package)

. 10 LSTTL LOADS
SYMMETRICAL OUTPUT IMPEDANCE

. IOH = IOL = 4 mA (MIN.)

BALANCED PROPAGATION DELAYS

. tPLH = tPHL
WIDE OPERATING VOLTAGE RANGE
M1R
(Micro Package)
C1R
(Chip Carrier)

. VCC (OPR) = 2 V TO 6 V
WIDE OUTPUT PULSE WIDTH RANGE
ORDER CODES :
M54HCXXXF1R M74HCXXXXM1R

. tWOUT = 150 ns ∼ 60 s OVER AT VCC = 4.5 V

PIN AND FUNCTION COMPATIBLE WITH
54/74LS221
M74HCXXXB1R M74HCXXXC1R

DESCRIPTION PIN CONNECTIONS (top view)

The M54/74HC221/221A are high speed CMOS
MONOSTABLE multivibrators fabricated with sili-
con gate C2MOS technology. It achieves the high
speed operation similar to equivalent LSTTL while
maintaining the CMOS low power dissipation. There
are two trigger inputs, A INPUT (negative edge) and
B INPUT (positive edge). Triggering on the B input
occurs at a particular voltage threshold and is not re-
lated to the rise and fall time of the applied pulse.
The device may also be triggered by using the CLR
input (positive-edge) because of the Schmitt-trigger
input ; after triggering the output maintains the
MONOSTABLEstate for the time period determined
by the external resistor Rx and capacitor Cx.Taking
CLR low breaks this MONOSTABLE STATE. If the
next trigger pulse occurs during the MONOSTABLE
period it makes the MONOSTABLE period longer.
Limit for values of Cx and Rx :
Cx : NO LIMIT
Rx : VCC < 3.0 V 5 K Ω to 1 M Ω
VCC ≥ 3.0 V 1 K Ω to 1 M Ω
Two different pulse width constants are available:
K ≅ 0.7 for HC221
K ≅ 1 for HC221A
All inputs are equipped with protection circuits NC =
No Internal
against static discharge and transient excess volt- Connection
age.

October 1993 1/14

M54/M74HC221/221A

SYSTEM DIAGRAM

TIMING CHART

2/14
 M54/M74HC221/221A

BLOCK DIAGRAM

Note :
(1) Cx, Rx, Dx are external components.
(2) Dx is a clamping diode.
The external capacitor is charged to VCC inthe stand-by state, i.e. no trigger. When the supply voltage is turned off Cx is discharged mainly
through an internal parasitic diode (see figures). If Cx is sufficiently large and VCC decreases rapidy, there will be some possibility of da-
maging the I.C. with a surge current or latch-up. If the voltage supply filter capacitor is large enough and VCC decrease slowly, the surge
current is automatically limited and damage the I.C. is avoided. The maximum forward current of the parasitic diode is approximately 20
mA. In cases where Cx is large the time taken for the supply voltage to fall to 0.4 VCC can be calculated as follows :
tf ≥ (VCC – 0.7) ⋅ Cx/20mA
In cases where tf is too short an external clamping diode is required to protect the I.C. from the surge current.

FUNCTIONAL DESCRIPTION The voltage at R/C external begins to rise with a time
constant set by the external components Rx, Cx.
STAND-BY STATE
Triggering the multivibrator causes Q to go high after
The external capacitor, Cx, is fully charged to VCC internal delay due to the flip-flop and the gate. Q re-
in the stand-by state. Hence, before triggering, tran- mains high until the voltage at R/C external rises
sistor Qp and Qn (connected to the Rx/Cx node) are again to VREFH. At this point C2 output goes low and
both turned-off. The two comparators that control O goes low. C2 stop operating. That means that
the timing and the two reference voltage sources after triggering when the voltage R/C external re-
stop operating. The total supply current is therefore turns to VREFH the multivibrator has returned to its
only leakage current. MONOSTABLE STATE. In the case where Rx ⋅ Cx
are large enough and the discharge time of the ca-
TRIGGER OPERATION
pacitor and the delay time in the I.C. can be ignored,
Triggering occurs when : the width of the output pulse tw (out) is as follows :
1st) A is ”low” and B has a falling edge ; tW(OUT) = 0.70 Cx ⋅ Rx (HC221)
2nd) B is ”high” and A has a rising edge ; tW(OUT) = Cx ⋅ Rx (HC221A)
rd
3 ) A is low and B is high and C1 has a rising edge.
RESET OPERATION
After the multivibrator has been retriggered com-
parator C1 and C2 start operating and Qn is turned CL is normally high. If CL is low, the trigger is not ef-
on. Cx then discharges through Qn. The voltage at fective because Q output goes low and trigger con-
trol flip-flop is reset.
the node R/C external falls.
When it reaches VREFL the output of comparator C1 Also transistor Op is turned on and Cx is charged
becomes low. This in turn resets the flip-flop and Qn quicky to VCC. This means if CL input goes low, the
IC becomes waiting state both in operating and non
is turned off.
operating state.
At this point C1 stops functioning but C2 continues
to operate.

3/14
M54/M74HC221/221A

TRUTH TABLE
INPUTS OUTPUTS
NOTE
A B CLR Q Q
H H OUTPUT ENABLE
X L H L (*) H (*) INHIBIT
H X H L (*) H (*) INHIBIT
L H OUTPUT ENABLE
L H OUTPUT ENABLE
X X L L H INHIBIT
X: Don’t Care (*): Except for monostble period

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION IEC LOGIC SYMBOL

PIN No SYMBOL NAME AND FUNCTION

1, 9 1A, 2A Trigger Inputs (Negative
Edge Triggered)
2, 10 1B, 2B Trigger Inputs (Positive
Edge Triggered)
3, 11 1CLR, Direct Reset LOW and
2CLR Trigger Action at Positive
Edge
4, 12 1Q, 2Q Outputs (Active LOW)
7 2REXT/CEXT External Resistor
Capacitor Connection
13, 5 1Q, 2Q Outputs (Active HIGH)
14, 6 1CEXT External Capacitor
2CEXT Connection
15 1REXT/CEXT External Resistor
Capacitor Connection
8 GND Ground (0V)
16 V CC Positive Supply Voltage

4/14
 M54/M74HC221/221A

ABSOLUTE MAXIMUM RATING

Symbol Parameter Value Unit
VCC Supply Voltage -0.5 to +7 V
VI DC Input Voltage -0.5 to VCC + 0.5 V
VO DC Output Voltage -0.5 to VCC + 0.5 V
IIK DC Input Diode Current ± 20 mA
IOK DC Output Diode Current ± 20 mA
IO DC Output Source Sink Current Per Output Pin ± 25 mA
ICC or IGND DC VCC or Ground Current ± 50 mA
PD Power Dissipation 500 (*) mW
o
Tstg Storage Temperature -65 to +150 C
o
TL Lead Temperature (10 sec) 300 C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition isnotimplied.
(*) 500 mW: ≅ 65 oC derate to 300 mW by 10mW/oC: 65 oC to 85 oC

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Value Unit
VCC Supply Voltage 2 to 6 V
VI Input Voltage 0 to VCC V
VO Output Voltage 0 to VCC V
o
Top Operating Temperature: M54HC Series -55 to +125 C
o
M74HC Series -40 to +85 C
tr, tf Input Rise and Fall Time (CLR and A only) VCC = 2 V 0 to 1000 ns
VCC = 4.5 V 0 to 500
VCC = 6 V 0 to 400
CX External Capacitor > 100 (*) pF
RX External Resistor VCC < 3 V 5K to 1M (*) Ω
VCC ≥ 3 V 1K to 1M (*)
(*)The maximum allowable values of Cx and Rx are a function of leackage of capacitor Cx, the leackage of HC221/A, and leackage due to the
board layout and surface resistance. Susceptibility to externally induced noise signals may occur for Rx > 1MΩ

5/14
M54/M74HC221/221A

DC SPECIFICATIONS
Test Conditions Value
Symbol Parameter TA = 25 oC -40 to 85 oC -55 to 125 oC Unit
VCC
54HC and 74HC 74HC 54HC
(V)
Min. Typ. Max. Min. Max. Min. Max.
VIH High Level Input 2.0 1.5 1.5 1.5
Voltage 4.5 3.15 3.15 3.15 V
6.0 4.2 4.2 4.2
V IL Low Level Input 2.0 0.5 0.5 0.5
Voltage 4.5 1.35 1.35 1.35 V
6.0 1.8 1.8 1.8
V OH High Level 2.0 1.9 2.0 1.9 1.9
VI =
Output Voltage 4.5 IO=-20 µA 4.4 4.5 4.4 4.4
VIH
(Q, Q Output) V
6.0 or 5.9 6.0 5.9 5.9
4.5 V IL IO=-4.0 mA 4.18 4.31 4.13 4.10
6.0 IO=-5.2 mA 5.68 5.8 5.63 5.60
VOL Low Level Output 2.0 0.0 0.1 0.1 0.1
VI =
Voltage 4.5 IO= 20 µA 0.0 0.1 0.1 0.1
VIH
(Q, Q Output) V
6.0 or 0.0 0.1 0.1 0.1
4.5 V IL IO= 4.0 mA 0.17 0.26 0.33 0.40
6.0 IO= 5.2 mA 0.18 0.26 0.33 0.40
II Input Leakage VI = VCC or GND ±0.1 ±1 ±1 µA
6.0
Current
II R/C Terminal Off VI = VCC or GND ±0.5 ±5 ±10 µA
6.0
State Current
ICC Quiescent Supply 6.0 VI = VCC or GND 4 40 80 µA
Current
ICC’ Active State 2.0 VI = VCC or GND 45 250 260 350 µA
Supply Current (1) 4.5 VIN = VCC/2 400 530 650 850 µA
6.0 0.7 1 1.3 1.7 mA
(1): Per Circuit

6/14
 M54/M74HC221/221A

AC ELECTRICAL CHARACTERISTICS (C L = 50 pF, Input t r = tf = 6 ns)

Test Conditions Value
Symbol Parameter TA = 25 oC -40 to 85 oC -55 to 125 oC Unit
VCC
54HC and 74HC 74HC 54HC
(V)
Min. Typ. Max. Min. Max. Min. Max.
tTLH Output Transition 2.0 30 75 95 110
tTHL Time 4.5 8 15 19 22 ns
6.0 7 13 16 19
tPLH Propagation 2.0 102 210 265 315
tPHL Delay Time 4.5 30 42 53 63 ns
(A, B - Q, Q) 6.0 24 36 45 54
tPLH Propagation 2.0 102 235 295 355
tPHL Delay Time 4.5 30 47 59 71 ns
(CLRTRIGGER- Q,Q) 6.0 24 40 50 60
tPLH Propagation 2.0 67 160 200 240
tPHL Delay Time 4.5 20 32 40 48 ns
(CLR - Q, Q) 6.0 16 27 34 41
tWOUT Output Pulse 2.0 CX = 100 pF 1.5
Width 4.5 RX = 10 KΩ 1.3 µs
(for HC221) 6.0 1.2
2.0 CX = 0.1 µF 7
4.5 RX = 100 KΩ 6.9 ms
6.0 6.9
tWOUT Output Pulse 2.0 CX = 100 pF 1.8
Width 4.5 RX = 10 KΩ 1.5 µs
(for HC221A) 6.0 1.4
2.0 CX = 0.1 µF 10
4.5 RX = 100 KΩ 9.7 ms
6.0 9.6
∆tWOUT Output Pulse ±1
Width Error
%
Between Circuits
in Same Package
tW(H) Minimum Pulse 2.0 75 95 110
tW(L) Width 4.5 15 19 22 ns
6.0 13 16 20
tW(L) Minimum Pulse 2.0 75 95 110
Width 4.5 15 19 22 ns
6.0 13 16 20
CIN Input Capacitance 5 10 10 10 pF
CPD (*) Power Dissipation 174
pF
Capacitance
(*) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load.
(RefertoTestCircuit). Average operting current canbeobtained by thefollowing equation. ICC(opr) =CPD •VCC •fIN +ICC’ Duty/100 + IC/2 (per monostable)
(ICC’: Active Supply Current) (Duty:%)

7/14
M54/M74HC221/221A

Output Pulse Width Constant Characteristics Output Pulse Width Constant Characteristics
(for HC221) (for HC221A)

Output Pulse Width Characteristics (for HC221) Output Pulse Width Characteristics (for HC221A)

8/14
 M54/M74HC221/221A

SWITCHING CHARACTERISTICS TEST WAVEFORM

TEST WAVEFORM

Input Transition Time : 6ns

VIH = VCC, VIL = GND.

9/14
M54/M74HC221/221A

Plastic DIP16 (0.25) MECHANICAL DATA

mm inch
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.

a1 0.51 0.020

B 0.77 1.65 0.030 0.065

b 0.5 0.020

b1 0.25 0.010

D 20 0.787

E 8.5 0.335

e 2.54 0.100

e3 17.78 0.700

F 7.1 0.280

I 5.1 0.201

L 3.3 0.130

Z 1.27 0.050

P001C

10/14
 M54/M74HC221/221A

Ceramic DIP16/1 MECHANICAL DATA

mm inch
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.

A 20 0.787

B 7 0.276

D 3.3 0.130

E 0.38 0.015

e3 17.78 0.700

F 2.29 2.79 0.090 0.110

G 0.4 0.55 0.016 0.022

H 1.17 1.52 0.046 0.060

L 0.22 0.31 0.009 0.012

M 0.51 1.27 0.020 0.050

N 10.3 0.406

P 7.8 8.05 0.307 0.317

Q 5.08 0.200

P053D

11/14
M54/M74HC221/221A

SO16 (Narrow) MECHANICAL DATA

mm inch
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.
A 1.75 0.068
a1 0.1 0.2 0.004 0.007
a2 1.65 0.064
b 0.35 0.46 0.013 0.018
b1 0.19 0.25 0.007 0.010
C 0.5 0.019
c1 45° (typ.)
D 9.8 10 0.385 0.393
E 5.8 6.2 0.228 0.244
e 1.27 0.050
e3 8.89 0.350
F 3.8 4.0 0.149 0.157
G 4.6 5.3 0.181 0.208
L 0.5 1.27 0.019 0.050
M 0.62 0.024
S 8° (max.)

P013H

12/14
 M54/M74HC221/221A

PLCC20 MECHANICAL DATA

mm inch
DIM.
MIN. TYP. MAX. MIN. TYP. MAX.

A 9.78 10.03 0.385 0.395

B 8.89 9.04 0.350 0.356

D 4.2 4.57 0.165 0.180

d1 2.54 0.100

d2 0.56 0.022

E 7.37 8.38 0.290 0.330

e 1.27 0.050

e3 5.08 0.200

F 0.38 0.015

G 0.101 0.004

M 1.27 0.050

M1 1.14 0.045

P027A

13/14
M54/M74HC221/221A

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use ascritical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.

 1994 SGS-THOMSON Microelectronics - All Rights Reserved

SGS-THOMSON Microelectronics GROUP OF COMPANIES

Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A

14/14