UT54ACS264 Datasheet, PDF (1/11 Pages) Aeroflex Circuit Technology – Look-Ahead Carry Generators for Counters

Standard Products
UT54ACS264/UT54ACTS264
Look-Ahead Carry Generators for Counters
Datasheet
November 2010
www.aeroflex.com/logic
FEATURES
‰ Performs look-ahead carry across n-bit counters
‰ Accommodates active-high or active-low carry
‰ Improves cascaded counters system performance
‰ 1.2μ CMOS
- Latchup immune
‰ High speed
‰ Low power consumption
‰ Single 5 volt supply
‰ Available QML Q or V processes
‰ Flexible package
- 16-pin DIP
- 16-lead flatpack
‰ UT54ACS264- SMD 5962-96576
‰ UT54ACTS264 - SMD 5962-96577
DESCRIPTION
The UT54ACS264 and the UT54ACTS264 are look-ahead gen-
erators designed specifically to perform a carry-anticipate across
any number of n-bit counters, thus increasing system clock fre-
quency. A carry enable CE, and carry outputs RCOA and RCOB
are provided for n-bit cascading.
Use the counter with either active-high-carry or active-low-car-
ry counters. For active-high-carry counters, CE is active high,
the A set of inputs and output RCOA are used. The B set of
inputs are connected to a low logic level. For active-low-carry
counters, CE is active low, the B set of inputs and output RCOB
are used. The A set of inputs are connected to a high logic level.
The devices are characterized over full military temperature
range of -55°C to +125°C.
PINOUTS
A1
B1
A0
B0
A3
B3
RCOB
V_SS
16-Pin DIP
Top View
A1
1 16
V_DD
B1 ^{2 15} B2
A0 ^{3 14} A2
B0 4 ¹³ CE
A3 5 ¹² C0
B3 6 11 C1
RCOB 7 10 RCOA
V_SS
8
9 C2
16-Lead Flatpack
Top View
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
V_DD
B2
A2
CE
C0
C1
RCOA
C2
1