74AC169 4-Stage Synchronous Bidirectional Counter
November 1988
Revised November 1999
74AC169
4-Stage Synchronous Bidirectional Counter
General Description
The AC169 is fully synchronous 4-stage up/down counter.
The AC169 is a modulo-16 binary counter. It features a
preset capability for programmable operation, carry looka-
head for easy cascading and a U/D input to control the
direction of counting. All state changes, whether in count-
ing or parallel loading, are initiated by the LOW-to-HIGH
transition of the Clock.
Features
s
I
CC
reduced by 50%
s
Synchronous counting and loading
s
Built-In lookahead carry capability
s
Presettable for programmable operation
s
Outputs source/sink 24 mA
Ordering Code:
Order Number
74AC169SC
74AC169SJ
74AC169MTC
74AC169PC
Package Number
M16A
M16D
MTC16
N16E
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150鈥?Narrow Body
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300鈥?Wide
Device also available in Tape and Reel. Specify by appending suffix letter 鈥淴鈥?to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
Pin Descriptions
Pin Names
CEP
CET
CP
P
0
鈥揚
3
PE
U/D
Q
0
鈥換
3
TC
Description
Count Enable Parallel Input
Count Enable Trickle Input
Clock Pulse Input
Parallel Data Inputs
Parallel Enable Input
Up-Down Count Control Input
Flip-Flop Outputs
Terminal Count Output
FACT錚?is a trademark of Fairchild Semiconductor Corporation.
漏 1999 Fairchild Semiconductor Corporation
DS009934
www.fairchildsemi.com