74AC161 Datasheet, PDF (1/11 Pages) STMicroelectronics – SYNCHRONOUS PRESETTABLE 4-BIT COUNTER

November 1988
Revised November 1999
74AC161 • 74ACT161
Synchronous Presettable Binary Counter
General Description
The AC/ACT161 are high-speed synchronous modulo-16
binary counters. They are synchronously presettable for
application in programmable dividers and have two types
of Count Enable inputs plus a Terminal Count output for
versatility in forming synchronous multistage counters. The
AC/ACT161 has an asynchronous Master Reset input that
overrides all other inputs and forces the outputs LOW.
Features
s I_CC reduced by 50%
s Synchronous counting and loading
s High-speed synchronous expansion
s Typical count rate of 125 MHz
s Outputs source/sink 24 mA
s ACT161 has TTL-compatible inputs
Ordering Code:
Order Number Package Number
Package Description
74AC161SC
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body
74AC161SJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74AC161MTC
MTC16
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74AC161PC
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
74ACT161SC
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body
74ACT161SJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ACT161MTC
MTC16
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74ACT161PC
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Connection Diagram
Logic Symbols
IEEE/IEC
Pin Descriptions
Pin Names
CEP
CET
CP
MR
P₀–P₃
PE
Q₀–Q₃
TC
Description
Count Enable Parallel Input
Count Enable Trickle Input
Clock Pulse Input
Asynchronous Master Reset Input
Parallel Data Inputs
Parallel Enable Inputs
Flip-Flop Outputs
Terminal Count Output
FACT is a trademark of Fairchild Semiconductor Corporation.
© 1999 Fairchild Semiconductor Corporation DS009931
www.fairchildsemi.com