UT54ACS193E Datasheet, PDF (1/11 Pages) Aeroflex Circuit Technology – Synchronous 4-Bit Up-Down Dual Clock Counter

UT54ACS193E
Synchronous 4-Bit Up-Down Dual Clock Counter
July 2013
www.aeroflex.com/Logic
Datasheet
FEATURES
 Look-ahead circuitry enhances cascaded counters
 Fully synchronous in count modes
 Parallel asynchronous load for modulo-N count lengths
 Asynchronous clear
 m CRH CMOS process
- Latchup immune
 High speed
 Low power consumption
 Wide power supply operating range of 3.0V to 5.5V
 Available QML Q or V processes
 16-lead flatpack
 UT54ACS193E - SMD 5962-96566
DESCRIPTION
The UT54ACS193E is a synchronous 4-bit, reversible up-down
binary counter. Synchronous operation is provided by having
all flip-flops clocked simultaneously so that the outputs change
coincident with each other when instructed. Synchronous
operation eliminates the output counting spikes normally
associated with asynchronous counters.
The outputs of the four flip-flops are triggered on a low-to-high-
level transition of either count input (Up or Down). The direc-
tion of the counting is determined by which count input is pulsed
while the other count input is high.
The counter is fully programmable. The outputs may be preset
to either level by placing a low on the load input and entering
the desired data at the data inputs. The outputs will change to
agree with the data inputs independently of the count pulses.
Asynchronous loading allows the counter to be used as modulo-
N divider by simply modifying the count length with the preset
inputs.
A clear input has been provided that forces all outputs to the
low level when a high level is applied. The clear function is
independent of the count and the load inputs.
The counter is designed for efficient cascading without the need
for external circuitry. The borrow output (BO) produces a low-
level pulse while the count is zero and the down input is low.
Similarly, the carry output (CO) produces a low-level pulse
while the count is maximum and the up input is low.
The device is characterized over full HiRel temperature range
of -55^oC to +125^oC.
PINOUT
B
Q_B
Q_A
DOWN
UP
Q_C
Q_D
V_SS
16-Lead Flatpack
TopView
1 16
2 15
3 14
4 13
5 12
6 11
7 10
8
9
V_DD
A
CLR
BO
CO
LOAD
C
D
FUNCTION TABLE
FUNCTION
CLOCK
UP
CLOCK
DOWN
CLR
Count Up

H
L
Count Down
H

L
Reset
X
X
H
Load Preset
X
X
L
Input
LOAD
H
H
X
L
1