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TL/F/9496
54F/74F192 Up/Down Decade Counter with Separate Up/Down Clocks
November 1994
54F/74F192
Up/Down Decade Counter
with Separate Up/Down Clocks
General Description
The ’F192 is an up/down BCD decade (8421) counter. Separate Count Up and Count Down Clocks are used, and in
either counting mode the circuits operate synchronously.
The outputs change state synchronously with the LOW-toHIGH transitions on the clock inputs.
Separate Terminal Count Up and Terminal Count Down outputs are used as the clocks for a subsequent stage without
extra logic, thus simplifying multistage counter designs. Indi-
vidual preset inputs allow the circuit to be used as a programmable counter. Both the Parallel Load (PL
) and the
Master Reset (MR) inputs asynchronously override the
clocks.
Features
Y
Guaranteed 4000V minimum ESD protection
Commercial Military
Package
Package Description
Number
74F192PC N16E 16-Lead (0.300×Wide) Molded Dual-In-Line
54F192DM (Note 2) J16A 16-Lead Ceramic Dual-In-Line
74F192SC (Note 1) M16A 16-Lead (0.150×Wide) Molded Small Outline, JEDEC
74F192SJ (Note 1) M16D 16-Lead (0.300×Wide) Molded Small Outline, EIAJ
54F192FM (Note 2) W16A 16-Lead Cerpack
54F192LM (Note 2) E20A 20-Lead Ceramic Leadless Chip Carrier, Type C
Note 1: Devices also available in 13×reel. Use suffixeSCX and SJX.
Note 2: Military grade device with environmental and burn-in processing. Use suffix
e
DMQB, FMQB and LMQB.
Logic Symbols Connection Diagrams
TL/F/9496– 3
IEEE/IEC
TL/F/9496– 6
Pin Assignment for
DIP, SOIC and Flatpak
TL/F/9496– 1
Pin Assignment
for LCC
TL/F/9496– 2
TRI-STATEÉis a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation RRD-B30M75/Printed in U. S. A.
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Unit Loading/Fan Out
54F/74F
Pin Names Description
U.L. Input I
IH/IIL
HIGH/LOW Output IOH/I
OL
CP
U
Count Up Clock Input (Active Rising Edge) 1.0/3.0 20 mA/b1.8 mA
CP
D
Count Down Clock Input (Active Rising Edge) 1.0/3.0 20 mA/b1.8 mA
MR Asynchronous Master Reset Input (Active HIGH) 1.0/1.0 20 mA/
b
0.6 mA
PL Asynchronous Parallel Load Input (Active LOW) 1.0/1.0 20 mA/b0.6 mA
P
0–P3
Parallel Data Inputs 1.0/1.0 20 mA/b0.6 mA
Q0–Q3Flip-Flop Outputs 50/33.3b1 mA/20 mA
TC
D
Terminal Count Down (Borrow) Output (Active LOW) 50/33.3b1 mA/20 mA
TC
U
Terminal Count Up (Carry) Output (Active LOW) 50/33.3b1 mA/20 mA
Functional Description
The ’F192 is an asynchronously presettable decade counter. It contains four edge-triggered flip-flops, with internal
gating and steering logic to provide master reset, individual
preset, count up and count down operations.
A LOW-to-HIGH transition on the CP input to each flip-flop
causes the output to change state. Synchronous switching,
as opposed to ripple counting, is achieved by driving the
steering gates of all stages from a common Count Up line
and a common Count Down line, thereby causing all state
changes to be initiated simultaneously. A LOW-to-HIGH
transition on the Count Up input will advance the count by
one; a similar transition on the Count Down input will decrease the count by one. While counting with one clock input, the other should be held HIGH, as indicated in the
Function Table. Otherwise, the circuit will either count by
twos or not at all, depending on the state of the first flip-flop,
which cannot toggle as long as either clock input is LOW.
The Terminal Count Up (TC
U
) and Terminal Count Down
(TC
D
) outputs are normally HIGH. When the circuit has
reached the maximum count state 9, the next HIGH-to-LOW
transition of the Count Up Clock will cause TC
U
to go LOW.
TC
U
will stay LOW until CPUgoes HIGH again, thus effectively repeating the Count Up Clock, but delayed by two
gate delays. Similarly, the TC
D
output will go LOW when the
circuit is in the zero state and the Count Down Clock goes
LOW. Since the TC
outputs repeat the clock waveforms,
they can be used as the clock input signals to the next
higher order circuit in a multistage counter.
TC
U
e
Q
0
#
Q
3
#
CP
U
TC
D
e
Q
0
#
Q
1
#
Q
2
#
Q
3
#
CP
D
The ’F192 has an asynchronous parallel load capability permitting the counter to be preset. When the Parallel Load
(PL
) and the Master Reset (MR) inputs are LOW, informa-
tion present on the Parallel Data input (P
0–P3
) is loaded
into the counter and appears on the outputs regardless of
the conditions of the clock inputs. A HIGH signal on the
Master Reset input will disable the preset gates, override
both clock inputs, and latch each Q output in the LOW state.
If one of the clock inputs is LOW during and after a reset or
load operation, the next LOW-to-HIGH transition of that
clock will be interpreted as a legitimate signal and will be
counted.
Function Table
MR PL CP
U
CP
D
Mode
H X X X Reset (Asyn.)
L L X X Preset (Asyn.)
L H H H No Change
LHLH Count Up
LH HLCount Down
HeHIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
L
e
LOW-to-HIGH Clock Transition
State Diagram
TL/F/9496– 4
2
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Logic Diagram
TL/F/9496– 5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
3
Page 4
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Storage Temperature
b
65§Ctoa150§C
Ambient Temperature under Bias
b
55§Ctoa125§C
Junction Temperature under Bias
b
55§Ctoa175§C
Plastic
b
55§Ctoa150§C
V
CC
Pin Potential to
Ground Pin
b
0.5V toa7.0V
Input Voltage (Note 2)
b
0.5V toa7.0V
Input Current (Note 2)
b
30 mA toa5.0 mA
Voltage Applied to Output
in HIGH State (with V
CC
e
0V)
Standard Output
b
0.5V to V
CC
TRI-STATEÉOutput
b
0.5V toa5.5V
Current Applied to Output
in LOW State (Max) twice the rated I
OL
(mA)
Note 1: Absolute maximum ratings are values beyond which the device may
be damaged or have its useful life impaired. Functional operation under
these conditions is not implied.
Note 2: Either voltage limit or current limit is sufficient to protect inputs.
Recommended Operating
Conditions
Free Air Ambient Temperature
Military
b
55§Ctoa125§C
Commercial 0
§
Ctoa70§C
Supply Voltage
Military
a
4.5V toa5.5V
Commercial
a
4.5V toa5.5V
DC Electrical Characteristics
Symbol Parameter
54F/74F
Units V
CC
Conditions
Min Typ Max
V
IH
Input HIGH Voltage 2.0 V Recognized as a HIGH Signal
V
IL
Input LOW Voltage 0.8 V Recognized as a LOW Signal
V
CD
Input Clamp Diode Voltage
b
1.2 V Min I
IN
eb
18 mA
V
OH
Output HIGH 54F 10% V
CC
2.5 I
OH
eb
1mA
Voltage 74F 10% V
CC
2.5 V Min I
OH
eb
1mA
74F 5% V
CC
2.7 I
OH
eb
1mA
V
OL
Output LOW 54F 10% V
CC
0.5
V Min
I
OL
e
20 mA
Voltage 74F 10% V
CC
0.5 I
OL
e
20 mA
I
IH
Input HIGH 54F 20.0
mA Max
V
IN
e
2.7V
Current 74F 5.0
I
BVI
Input HIGH Current 54F 100
mA Max
V
IN
e
7.0V
Breakdown Test 74F 7.0
I
CEX
Output HIGH 54F 250
mA Max
V
OUT
e
V
CC
Leakage Current 74F 50
V
ID
Input Leakage
74F 4.75 V 0.0
I
ID
e
1.9 mA
Test All Other Pins Grounded
I
OD
Output Leakage
74F 3.75 mA 0.0
V
IOD
e
150 mV
Circuit Current All Other Pins Grounded
I
IL
Input LOW Current
b
0.6
mA Max
V
IN
e
0.5V, Except CPu,CP
D
b
1.8 V
IN
e
0.5V, CPu,CP
D
I
OS
Output Short-Circuit Current
b
60
b
150 mA Max V
OUT
e
0V
I
CCL
Power Supply Current 38 55 mA Max V
O
e
LOW
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AC Electrical Characteristics
74F 54F 74F
T
A
ea
25§C
T
A,VCC
e
Mil TA,V
CC
e
Com
Symbol Parameter V
CC
ea
5.0V
C
L
e
50 pF C
L
e
50 pF
Units
C
L
e
50 pF
Min Typ Max Min Max Min Max
f
max
Maximum Clock Frequency 100 125 75 90 MHz
t
PLH
Propagation Delay CPUor 4.0 7.0 9.0 4.0 10.5 4.0 10.0
ns
t
PHL
CPDto TCUor TC
D
3.5 6.0 8.0 3.5 9.5 3.5 9.0
t
PLH
Propagation Delay 4.0 6.5 8.5 4.0 10.0 4.0 9.5
ns
t
PHL
CPUor CPDto Q
n
5.5 9.5 12.5 5.5 14.0 5.5 13.5
t
PLH
Propagation Delay 3.0 4.5 7.0 3.0 8.5 3.0 8.0
ns
t
PHL
Pnto Q
n
6.0 11.0 14.5 6.0 16.5 6.0 15.5
t
PLH
Propagation Delay 5.0 8.5 11.0 5.0 13.5 5.0 12.0
ns
t
PHL
PL to Q
n
5.5 10.0 13.0 5.5 15.0 5.5 14.0
t
PHL
Propagation Delay
6.5 11.0 14.5 6.5 16.0 6.5 15.5
MR to Q
n
t
PLH
Propagation Delay
6.0 10.5 13.5 6.0 15.0 6.0 14.5 ns
MR to TC
U
t
PHL
Propagation Delay
7.0 11.5 14.5 7.0 16.0 7.0 15.5
MR to TC
D
t
PLH
Propagation Delay 7.0 12.0 15.5 7.0 18.5 7.0 16.5
ns
t
PHL
PL to TCUor TC
D
7.0 11.5 14.5 7.0 17.5 7.0 15.5
t
PLH
Propagation Delay 7.0 11.5 14.5 7.0 16.5 7.0 15.5
ns
t
PHL
Pnto TCUor TC
D
6.5 11.0 14.0 6.5 16.5 6.5 15.0
AC Operating Requirements
74F 54F 74F
Symbol Parameter
T
A
ea
25§C
T
A,VCC
e
Mil TA,V
CC
e
Com Units
V
CC
ea
5.0V
Min Max Min Max Min Max
ts(H) Setup Time, HIGH or LOW 4.5 6.0 5.0
t
s
(L) Pnto PL 4.5 6.0 5.0
ns
th(H) Hold Time, HIGH or LOW 2.0 2.0 2.0
t
h
(L) Pnto PL 2.0 2.0 2.0
tw(L) PL Pulse Width, LOW 6.0 7.5 6.0 ns
tw(L) CPUor CP
D
5.0 7.0 5.0 ns
Pulse Width, LOW
tw(L) CPUor CP
D
Pulse Width, LOW 10.0 12.0 10.0 ns
(Change of Direction)
tw(H) MR Pulse Width, HIGH 6.0 6.0 6.0 ns
t
rec
Recovery Time
6.0 8.0 6.0 ns
PL
to CPUor CP
D
t
rec
Recovery Time
4.0 4.5 4.0 ns
MR to CPUor CP
D
5
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Ordering Information
The device number is used to form part of a simplified purchasing code where the package type and temperature range are
defined as follows:
74F 192 S C X
Temperature Range Family Special Variations
74F
e
Commercial XeDevices shipped in 13×reels
54F
e
Military QBeMilitary grade with environmental
and burn-in processing shipped
Device Type
in tubes
Package Code
Temperature Range
P
e
Plastic DIP
C
e
Commercial (0§Ctoa70§C)
D
e
Ceramic DIP
M
e
Military (b55§Ctoa125§C)
F
e
Flatpak
L
e
Leadless Ceramic Chip Carrier (LCC)
S
e
Small Outline SOIC JEDEC
SJ
e
Small Outline SOIC EIAJ
6
Page 7
Physical Dimensions inches (millimeters)
20-Lead Ceramic Leadless Chip Carrier (L)
NS Package Number E20A
16-Lead Ceramic Dual-In-Line Package (D)
NS Package Number J16A
7
Page 8
Physical Dimensions inches (millimeters) (Continued)
16-Lead (0.150×Wide) Molded Small Outline Package, JEDEC (S)
NS Package Number M16A
16-Lead (0.300×Wide) Molded Small Outline Package, EIAJ (SJ)
NS Package Number M16D
8
Page 9
Physical Dimensions inches (millimeters) (Continued)
16-Lead (0.300×Wide) Molded Dual-In-Line Package (P)
NS Package Number N16E
9
Page 10
54F/74F192 Up/Down Decade Counter with Separate Up/Down Clocks
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flatpak (F)
NS Package Number W16A
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