S E M I C O N D U C T O R
CD54AC191/3A
CD54ACT191/3A
Presettable Synchronous
4-Bit Binary Up/Down Counters
Functional Diagram
BINARY PRESET
P0
15
ASYN. PARALLEL 11
LOAD ENABLE
P1
1
P2
10
P3
9
3
2
CLOCK
14
6
7
UP/DOWN
5
Q2
Q3
Q0
Q1
BINARY
OUTPUTS
June 1997
COMPLETE DATA SHEET
COMING SOON!
Description
The CD54AC191/3A and CD54ACT191/3A are asynchro-
nously presettable binary up/down synchronous counters
that utilize the Harris Advanced CMOS Logic technology.
Presetting the counter to the number on preset data inputs
(P0-P3) is accomplished by setting LOW the asynchronous
parallel load input (PL). Counting occurs when PL is HIGH.
Count Enable (CE) is LOW, and the Up/Down (U/D) input is
either LOW for up-counting or HIGH for down-counting. The
counter is incremented or decremented synchronously with
the LOW-to-HIGH transition of the clock.
When an overflow or underflow of the counter occurs, the
Terminal Count (TC) output, which is LOW during counting,
goes HIGH and remains HIGH for one clock cycle. This
output can be used for look-ahead carry in high-speed
cascading. The TC output also initiates the Ripple Clock
(RC) output which, normally HIGH, goes LOW and remains
LOW for the low-level portion of the clock pulse. These
counters can be cascaded using the Ripple Count output.
The CD54AC191/3A and CD54ACT191/3A are supplied in
16-lead dual-in-line ceramic packages (F suffix).
12 TERMINAL
COUNT
COUNT
ENABLE
4
13
RIPPLE CLOCK
ACT INPUT LOAD TABLE
INPUT
P0 - P3, PL
CL, U/D, CE
NOTE:
1. Unit load is
∆I
CC
limit specified in DC Electrical Specifications
Table, e.g., 2.4mA Max at +25
o
C.
UNIT LOAD
(NOTE 1)
0.75
0.85
Absolute Maximum Ratings
DC Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +6V
DC Input Diode Current, I
IK
For V
I
< -0.5V or V
I
> V
CC
+ 0.5V
. . . . . . . . . . . . . . . . . . . . . .±20mA
DC Output Diode Current, I
OK
For V
O
< -0.5V or V
O
> V
CC
+ 0.5V
. . . . . . . . . . . . . . . . . . . . .±50mA
DC Output Source or Sink Current, Per Output Pin, I
O
For V
O
> -0.5V or V
O
< V
CC
+ 0.5V
. . . . . . . . . . . . . . . . . . . . .±50mA
DC V
CC
or GND Current, I
CC
or I
GND
For Up to 4 Outputs Per Device, Add
±25mA
For Each
Additional Output
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±100mA
Power Dissipation Per Package, P
D
T
A
= -55
o
C to +100
o
C (Package F) . . . . . . . . . . . . . . . . . . 500mW
T
A
= +100
o
C to +125
o
C (Package F) . . . . . . . . Derate Linearly at
8mW/
o
C to 300mW
Operating Temperature Range, T
A
Package Type F . . . . . . . . . . . . . . . . . . . . . . . . . . -55
o
C to +125
o
C
Storage Temperature, T
STG
. . . . . . . . . . . . . . . . . . -65
o
C to +150
o
C
Lead Temperature (During Soldering)
At Distance 1/16in.
±
1/32in. (1.59mm
±
0.79mm)
From Case For 10s Max . . . . . . . . . . . . . . . . . . . . . . . . . . +265
o
C
Unit Inserted Into a PC Board (Min Thickness 1/16in., 1.59mm)
With Solder Contacting Lead Tips Only. . . . . . . . . . . . . . . +300
o
C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Recommended Operating Conditions
Supply Voltage Range, V
CC
Unless Otherwise Specified, All Voltages Referenced to GND
T
A
= Full Package Temperature Range
CD54AC Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5V to 5.5V
CD54ACT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V
DC Input or Output Voltage, V
I
, V
O
. . . . . . . . . . . . . . . . . . 0V to V
CC
Operating Temperature, T
A
. . . . . . . . . . . . . . . . . . . -55
o
C to +125
o
C
Input Rise and Fall Slew Rate, dt/dv
at 1.5V to 3V (AC Types) . . . . . . . . . . . . . . . . . . . 0ns/V to 50ns/V
at 3.6V to 5.5V (AC Types) . . . . . . . . . . . . . . . . . 0ns/V to 20ns/V
at 4.5V to 5.5V (AC Types) . . . . . . . . . . . . . . . . . 0ns/V to 10ns/V
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures.
Copyright
©
Harris Corporation 1994
File Number
3896
1
Microcontroller MCU
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