1/12July 2001
■HIGH SPEED :
fMAX = 62 MHz (TY P.) at VCC = 6V
■LOW POWER DISSIPATION:
ICC =4µA(MA X.) a t TA=25°C
■HIGH NOISE IMMUNITY:
VNIH = VNIL = 28 % VCC (MIN.)
■SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 4mA (MIN)
■BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
■WIDE OPERATING VOLTAGE RANGE:
VCC (O PR) = 2V to 6V
■PIN AND FUNCTION COMPATIBLE WIT H
74 SERIES 161
DESCRIPTION
The M74HC161 is an high speed CMOS
SYNCHRONOUS 4-BIT BINARY
PRESETT ABLE CO UNTER fabri cate d wi t h sil icon
gate C2M OS technology.
The CLOCK input is active on the rising edge.
Both LOAD and CLEAR inputs are active LOW.
Presetting is synchronous on the rising edge of
the clock, the function is cleared asynchronously.
Two enable inputs (TE and PE) and CARRY
output are provided to enable easy cascading of
counters, which facilities easy implementation of
N-bit counters without using external gates.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
M74HC161
SYNCHRONOUS PRESETTABLE 4-B IT COUNTER
PIN CONNECTION AND IEC LO GIC SYMBOLS
ORDER CODES
PACKAGE TUBE T & R
DIP M74HC161B1R
SOP M74HC161M1R M74HC161RM13TR
TSSOP M74HC161TTR
TSSOPDIP SOP
Obsolete Product(s) - Obsolete Product(s)
M74HC161
2/12
INPUT AND OUT PUT EQUIVALENT CIRCUIT PIN DESCRIPTION
TRUTH TABLE
X : Don’t Care
A, B, C, D : Logic level of data inputs
Carry : CARRY = TE·QA·QB·QC·QD
LOGIC DIAGRAM
Th i s l ogic dia gram has not be used to estimat e propagation del ays
PIN No SYMBOL NAME AND FUNCTION
1 CLEAR Asynchronous Master
Reset
2 CLOCK Clock Input (LOW to
HIGH, Edge -trigge red)
3, 4, 5, 6 A, B, C, D Data Inputs
7 PE Count Enab le Input
10 TE Count Enable Carry Input
9LOAD
Parallel Enable Input
14, 13, 12,
11 QA to QD Flip Flop Outputs
15 CARRY Terminal Count Output
8 GND Ground (0V)
16 Vcc Positive Supply Voltage
INPUTS OUTPUTS FUNCTION
CLEAR LOAD PE TE CLOCK QA QB QC QD
L X X X X L L L L RESET TO "0"
H L X X A B C D PRESET DATA
H H X L NO CHANGE NO COUNT
H H L X NO CHANGE NO COUNT
H H H H COUNT UP COUNT
H X X X NO CHANGE NO COUNT
Obsolete Product(s) - Obsolete Product(s)
M74HC161
3/12
TIMING CHART
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are t hose v alues beyond which damage to the device may occur. Functional operation under these conditions is
not implie d
(* ) 500mW a t 65 °C; derate to 30 0m W by 10mW/°C fr om 65 °C to 85°C
Symbol Parameter Value Unit
VCC Supply Voltage -0.5 to +7 V
VIDC Input Voltage -0.5 to VCC + 0.5 V
VODC Output Volta ge -0.5 to VCC + 0.5 V
IIK DC Input Diode Current ± 20 mA
IOK DC Output Diode Current ± 20 mA
IODC Output Current ± 25 mA
ICC or IGND DC VCC or Ground Curre nt ± 50 mA
PDPower Dissipation 500(*) mW
Tstg Storage Temperature -65 to +150 °C
TLLead Temperature (10 sec) 300 °C
Obsolete Product(s) - Obsolete Product(s)
M74HC161
4/12
RECOMMENDE D OPERATING CONDITIONS
DC SPE CIFI CATI ONS
Symbol Parameter Value Unit
VCC Supply Voltage 2 to 6 V
VIInput Voltage 0 to VCC V
VOOutput Voltage 0 to VCC V
Top Operating Temperature -55 to 125 °C
tr, tf
Input Rise and Fall Time VCC = 2.0V 0 to 1000 ns
VCC = 4.5V 0 to 500 ns
VCC = 6.0V 0 to 400 ns
Symbol Parameter
Test Condition Value
Unit
VCC
(V)
TA = 25°C -40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
VIH High Level Input
Voltage 2.0 1.5 1.5 1.5 V4.5 3.15 3.15 3.15
6.0 4.2 4.2 4.2
VIL Low Level Input
Voltage 2.0 0.5 0.5 0.5 V4.5 1.35 1.35 1.35
6.0 1.8 1.8 1.8
VOH High Level Output
Voltage 2.0 IO=-20 µA1.9 2.0 1.9 1.9
V
4.5 IO=-20 µA4.4 4.5 4.4 4.4
6.0 IO=-20 µA5.9 6.0 5.9 5.9
4.5 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
Voltage 2.0 IO=20 µA0.0 0.1 0.1 0.1
V
4.5 IO=20 µA0.0 0.1 0.1 0.1
6.0 IO=20 µA0.0 0.1 0.1 0.1
4.5 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
IIInput Leakage
Current 6.0 VI = VCC or GND ± 0.1 ± 1 ± 1 µA
ICC Quiescent Supply
Current 6.0 VI = VCC or GND 44080µA
Obsolete Product(s) - Obsolete Product(s)
M74HC161
5/12
AC EL ECTRI CAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
Symbol Parameter
Test Condition Value
Unit
VCC
(V)
TA = 25°C -40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
tTLH tTHL Output Transition
Time 2.0 25 75 95 110 ns4.5 7151922
6.0 6131619
t
PLH tPHL Propagation Delay
Time
(CLOCK - Q)
2.0 48 125 155 190 ns4.5 16 25 31 38
6.0 14 21 26 32
tPLH tPHL Propagation Delay
Time
(CLOCK - CARRY)
2.0 57 150 190 225 ns4.5 19 30 38 45
6.0 16 26 32 38
tPLH tPHL Propagation Delay
Time
(TE - CARRY)
2.0 39 100 125 150 ns4.5 13 20 25 30
6.0 11 17 21 26
tPLH Propagation Delay
Time
(CLEAR - Q)
2.0 60 150 190 225 ns4.5 20 30 38 45
6.0 17 26 32 38
tPHL Propagation Delay
Time
(CLEAR - CARRY)
2.0 72 200 250 300 ns4.5 24 40 50 60
6.0 20 34 43 51
fMAX Maximum Clock
Frequency 2.0 6.2 18 5 4.2 MHz4.5 31 53 25 21
6.0 37 62 30 25
tW(H)
tW(L)
Minimum Pulse
Width (CLOCK) 2.0 18 75 95 110 ns4.5 6151922
6.0 6131619
t
W(L) Minimum Pulse
Width (CLEAR)2.0 24 75 95 110 ns4.5 7151922
6.0 6131619
t
s
Minimum Set-up
Time
(LOAD, PE, TE)
2.0 40 100 125 150 ns4.5 10 20 25 30
6.0 8172126
t
s
Minimum Set-up
Time
(A, B, C, D)
2.0 20 75 95 110 ns4.5 5151922
6.0 3131619
t
h
Minimum Hold
Time
(A, B - CLOCK)
2.0 0 0 0 ns4.5 0 0 0
6.0 0 0 0
tREM Minimum Removal
Time 2.0 18 50 65 75 ns4.5 4101315
6.0 3 9 11 13
Obsolete Product(s) - Obsolete Product(s)
M74HC161
6/12
CAPACITIVE CHARACT ERISTICS
1) C PD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
lo ad. (Ref er t o T est Circ ui t). Aver age operatin g current can be obta i ned by the foll owing equation. ICC(opr) = CPD x VCC x fIN + ICC
TEST CIRCUIT
CL = 50p F or equiva l ent (i nclud es ji g and probe capacitanc e)
RT = ZOUT of pulse ge nerator (typically 50Ω)
WAVEFORM 1: PROPAGATION DELAY TIMES, CLOCK MINIM UM PULSE WIDTH
(f=1MHz; 50% duty cycle)
Symbol Parameter
Test Condition Value
Unit
VCC
(V)
TA = 25°C -40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
CIN Input Capacitance 5.0 5101010pF
C
PD Power Dissipation
Capacitance (note
1) 5.0 50 pF
Obsolete Product(s) - Obsolete Product(s)
M74HC161
7/12
WAVE FORM 2 : PROPAGATION DELAY TIMES,CLEAR MINIMUM PULSE W IDTH (CLEAR M ODE)
(f=1MHz; 50% duty cycle)
WAVE FORM 3 : SETUP AND HOLD TIMES (PRESE T MODE) (f=1MHz; 50% duty cycle)
Obsolete Product(s) - Obsolete Product(s)
M74HC161
8/12
WAV EFORM 4 : SET UP AND HOLD TIM ES (COUNTENABLE MODE) (f= 1M Hz; 5 0% duty cycl e )
WAVEFORM 5 : PROPAGATION DELAY TIMES (CASCADE MODE) (f=1MHz; 50% duty cycle)
Obsolete Product(s) - Obsolete Product(s)
M74HC161
9/12
DIM. mm. inch
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
Plastic DIP-16 (0.25) MECHANICAL DAT A
P001C
Obsolete Product(s) - Obsolete Product(s)
M74HC161
10/12
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 1.75 0.068
a1 0.1 0.2 0.003 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
S8° (max.)
SO-16 MECHANICAL DATA
PO13H
Obsolete Product(s) - Obsolete Product(s)
M74HC161
11/12
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 1.2 0.047
A1 0.05 0.15 0.002 0.004 0.006
A2 0.8 1 1.05 0.031 0.039 0.041
b 0.19 0.30 0.007 0.012
c 0.09 0.20 0.004 0.0089
D 4.9 5 5.1 0.193 0.197 0.201
E 6.2 6.4 6.6 0.244 0.252 0.260
E1 4.3 4.4 4.48 0.169 0.173 0.176
e 0.65 BSC 0.0256 BSC
K0° 8°0° 8°
L 0.45 0.60 0.75 0.018 0.024 0.030
TSSOP16 MECHANICAL DATA
cE
b
A2
A
E1
D
1
PIN 1 IDENTIFICATION
A1 L
K
e
0080338D
Obsolete Product(s) - Obsolete Product(s)
M74HC161
12/12
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
conseque nces of use of such i nformation nor for any infringement of patents or ot her rights of third parties which may result from
its use. No licens e is granted by implication or otherwise under any patent or patent rights of STMicroelectron ics. S pecif ic at ions
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems with out expres s written approval of STMicroelec tronics .
© The ST logo is a registered trademark of STMicroelectronic s
© 2001 STMicroe lectro n ics - Prin ted in Italy - All Rights Reserv ed
STM icroelectron i cs GROUP OF COM P ANIES
Australia - Braz il - China - F i nl and - Fra nce - Germ any - Hong K ong - India - Italy - J apan - Ma l aysia - Ma lta - Morocco
Singapo re - S pain - S weden - Sw i tzerland - Uni ted Kingdom
© http://www.st.com
Obsolete Product(s) - Obsolete Product(s)
