74AC299, 74ACT299 — 8-Input Universal Shift/Storage Register with Common Parallel I/O Pins
©1988 Fairchild Semiconductor Corporation www.fairchildsemi.com
74AC299, 74ACT299 Rev. 1.4.0
January 2008
74AC299, 74ACT299
8-Input Universal Shift/Storage Register with Common
Parallel I/O Pins
Features
■
I
CC
and I
OZ
reduced by 50%
■
Common parallel I/O for reduced pin count
■
Additional serial inputs and outputs for expansion
■
Four operating modes: shift left, shift right, load
and store
■
3-STATE outputs for bus-oriented applications
■
Outputs source/sink 24mA
■
ACT299 has TTL-compatible inputs
General Description
The AC/ACT299 is an 8-bit universal shift/storage regis-
ter with 3-STATE outputs. Four modes of operation are
possible: hold (store), shift left, shift right and load data.
The parallel load inputs and flip-flop outputs are multi-
plexed to reduce the total number of package pins. Addi-
tional outputs are provided for flip-flops Q
0
, Q
7
to allow
easy serial cascading. A separate active LOW Master
Reset is used to reset the register.
Ordering Information
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering number.
All packages are lead free per JEDEC: J-STD-020B standard.
Order Number
Package
Number Package Description
74AC299SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74AC299SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74AC299MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm
Wide
74AC299PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
74ACT299SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74ACT299MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm
Wide
74ACT299PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide