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UT54ACTS169 Datasheet Preview

UT54ACTS169 Datasheet

4-Bit Up-Down Binary Counters

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Standard Products
UT54ACS169/UT54ACTS169
4-Bit Up-Down Binary Counters
Datasheet
November 2010
www.aeroflex.com/logic
FEATURES
‰ Fully synchronous operation for counting and programming
‰ Internal look-ahead for fast counting
‰ Carry output for n-bit cascading
‰ Fully independent clock circuit
‰ 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
‰ UT54ACS169 - SMD 5962-96560
‰ UT54ACTS169 - SMD 5962-96561
DESCRIPTION
The UT54ACS169 and the UT54ACTS169 are synchronous 4-
bit binary counters that feature an internal carry look-ahead for
cascading in high-speed counting applications. Synchronous
operation is provided by having all flip-flops clocked simulta-
neously so that the outputs change coincident with each other
when instructed by the count-enable inputs and internal gating.
Synchronous operation helps eliminate the output counting
spikes that are normally associated with asynchronous (ripple
clock) counters. The clock input triggers the four flip-flops on
the rising (positive-going) edge of the clock.
The counters are fully programmable (i.e., the outputs may each
be preset high or low). The load input circuitry allows loading
with the carry-enable output of cascaded counters. Loading is
synchronous; applying a low level at the load input disables the
counter and causes the outputs to agree with the data inputs after
the next clock pulse.
The carry look-ahead circuitry provides for cascaded counters
for n-bit synchronous application without additional gating. In-
strumental in accomplishing this function are two count-enable
inputs and a carry output. Assert both count enable inputs (ENP
and ENT) to count. The direction of the count is determined by
the level of the U/D input. When U/D is high, the counter counts
up; when low, it counts down. Input ENT is fed forward to
enable the carry output. The ripple carry output
RCO enables a low-level pulse while the count is zero (all inputs
low) counting down or maximum (15) counting up. The low-
level overflow carry pulse can be used to enable successive cas-
caded stages.
PINOUTS
16-Pin DIP
Top View
U/D
CLK
A
B
C
D
ENP
VSS
1
2
3
4
5
6
7
8
16 VDD
15 RCO
14 QA
13 QB
12 QC
11 QD
10 ENT
9 LOAD
16-Lead Flatpack
Top View
U/D
CLK
A
B
C
D
ENP
VSS
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
VDD
RCO
QA
QB
QC
QD
ENT
LOAD
Transitions at ENP or ENT are allowed regardless of the level
of the clock input.
The counters feature a fully independent clock circuit. Changes
at control inputs (ENP, ENT, LOAD, U/D) that modify the op-
erating mode have no effect on the contents of the counter until
clocking occurs. The function of the counter (whether enabled,
disabled, loading, or counting) will be dictated solely by the
conditions meeting the stable setup and hold times.
The devices are characterized over full military temperature
range of -55°C to +125°C.
1




Aeroflex Circuit Technology

UT54ACTS169 Datasheet Preview

UT54ACTS169 Datasheet

4-Bit Up-Down Binary Counters

No Preview Available !

LOGIC SYMBOL
(9)
LOAD
U/D (1)
(10)
ENT
(7)
ENP
(2)
CLK
CTRDIV 16
M1 (LOAD)
M2 (COUNT)
M3 (UP)
M4 (DOWN)
G5 3,5CT = 15
G6 4,5CT = 0
2,3,5,6+/C7
2,3,5,6-
(15)
RCO
(3)
A
(4)
B
(5)
C
(6)
D
1,7D
(1)
(2)
(4)
(8)
(14)
(13) QA
(12) QB
(11) QC
QD
Note:
1. Logic symbol in accordance with ANSI/IEEE Std 91-1984 and IEC
Publication 617-12.
FUNCTION TABLE
OUTPUT
LOAD ENP ENT U/D CLK
Count Up H L L H
Count Down
H
L
L
L
Load Preset
L
X
X
X
Inhibit
HHXXX
HXHXX
2


Part Number UT54ACTS169
Description 4-Bit Up-Down Binary Counters
Maker Aeroflex Circuit Technology
Total Page 11 Pages
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