Page 1
HD74LS293
4-bit Binary Counter
REJ03D0477–0300
Rev.3.00
Jul.15.2005
This counter contains four master-slave flip-flops and additional gating to provide a divide-by-two counter and divideby-eight counter. This counter has a gated zero reset. To use the maximum count length of this counter, the B input is
connected to the Q
appropriate function table.
Features
• Ordering Information
Part Name Package Type
HD74LS293P DILP-14 pin
output. The input count pulses are applied to input A and the outputs are as described in the
A
Package Code
(Previous Code)
PRDP0014AB-B
(DP-14AV)
Package
Abbreviation
Taping Abbreviation
(Quantity)
P —
Pin Arrangement
Function Table
Reset / Count
Reset Input Outputs
R
R
0 (1)
H H L L L L
L X Count
X L Count
1
NC
2
NC
3
NC
4
Q
C
Outputs
5
Q
B
6
NC
GND
Q
0 (2)
7
Q
D
Q
C
Q
B
Q
D
(Top view)
14
V
CC
R
0(2)
R
0(1)
B
13
12
11
R
0(2)
R
0(1)
B
Inputs
A
Q
A
10
A
9
Q
A
Outputs
8
Q
D
Q
C
Q
B
A
Rev.3.00, Jul.15.2005, page 1 of 7
Page 2
HD74LS293
BCD Count Sequence
Count
QD Q
0 L L L L
1 L L L H
2 L L H L
3 L L H H
4 L H L L
5 L H L H
6 L H H L
7 L H H H
8 H L L L
9 H L L H
10 H L H L
11 H L H H
12 H H L L
13 H H L H
14 H H H L
15 H H H H
Notes: 1. H; high level, L; low level, X; irrelevant
2. Output QA is connected to input B.
Block Diagram
Outputs
Q
C
Q
B
A
QQ
J
A
CKInput A
K
Q
J
B
Q
CKInput B
K
Q
J
Q
C
CK
K
Q
J
Q
D
CK
R
0(1)
R
0(2)
K
Rev.3.00, Jul.15.2005, page 2 of 7
Page 3
HD74LS293
Absolute Maximum Ratings
Item Symbol Ratings Unit
Supply voltage VCC 7 V
Input voltage
RO Inputs 7 V
A, B Inputs
VIN
5.5 V
Power dissipation PT 400 mW
Operating temperature Topr –20 to +75 °C
Storage temperature Tstg –65 to +150 °C
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Recommended Operating Conditions
Item Symbol Min Typ Max Unit
Supply voltage VCC 4.75 5.00 5.25 V
Output current
Operating temperature Topr –20 25 75 °C
Count frequency
A input 0 — 32
B input
A input 15 — —
Pulse width
B input 30 — —
Reset
inputs
Setup time tsu 25 — — ns
IOH — — –400 µA
I
— — 8 mA
OL
ƒ
count
t
w
0 — 16
MHz
ns
15 — —
Electrical Characteristics
(Ta = –20 to +75 °C)
Item Symbol min. typ.* max. Unit Condition
Input voltage
Output voltage
Any Reset — — 20
A input — — 40
B input
Input
current
Any Reset — — –0.4
A input — — –2.4
B input
Any Reset — — 0.1 VI = 7 V
A input — — 0.2
B input
Short-circuit output current IOS –20 — –100 mA VCC = 5.25 V
Supply current*** ICC — 9 15 mA VCC = 5.25 V
Input clamp voltage VIK — — –1.5 V VCC = 4.75 V, IIN = –18 mA
Notes: * VCC = 5 V, Ta = 25°C
** Q
output is tested at specified IOL plus the limit value of IIL for the B input. This permits driving the B input
A
while maintaining full fan-out capability.
*** I
is measured with all outputs open, both R0 inputs grounded following momentary connection to 4.5 V, and
CC
all other inputs grounded.
VIH 2.0 — — V
VIL — — 0.8 V
VOH 2.7 — — V
V
OL
I
IH
— — 0.4 IOL = 4 mA**
— — 0.5
µA VCC = 5.25 V, VI = 2.7 V
VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V,
= –400 µA
I
OH
V
I
= 8 mA**
OL
— — 40
I
IL
mA VCC = 5.25 V, VI = 0.4 V
— — –1.6
II
— — 0.2
mA
= 5.5 V
V
I
= 4.75 V,
V
CC
= 2 V, VIL = 0.8 V
V
IH
V
= 5.25 V
CC
Rev.3.00, Jul.15.2005, page 3 of 7
Page 4
HD74LS293
A
Switching Characteristics
(VCC = 5 V, Ta = 25°C)
Item Symbol Inputs Outputs min. typ. max. Unit Condition
Maximum count
frequency
Propagation delay
time
ƒ
max
t
— 10 16
PLH
t
PHL
t
— 46 70
PLH
t
PHL
t
— 10 16
PLH
t
PHL
t
— 21 32
PLH
t
PHL
t
— 34 51
PLH
t
PHL
Set-to-0 QA to QD — 26 40 ns
t
PHL
A QA 32 42 —
B QB 16 — —
A QA
A QD
B QB
B QC
B Q
D
— 12 18
— 46 70
— 14 21
— 23 35
— 34 51
MHz
ns
ns
ns
ns
ns
C
= 15 pF,
L
= 2 kΩ
R
L
Timing Method
t
w
R
0
or B
Input
1.3 V
1.3 V
t
su
1.3 V 1.3 V
t
w
3 V
0 V
3 V
0 V
Rev.3.00, Jul.15.2005, page 4 of 7
Page 5
HD74LS293
Testing Method
Test Circuit
4.5V
A
B
P.G.
Z
out
= 50Ω
R
0(1)
R
See Testing Table
0(2)
Notes: 1. CL includes probe and jig capacitance.
2. All diodes are 1S2074(H).
Testing Table
V
CC
Q
A
Load circuit 1
R
L
A
Q
C
L
Q
B
Q
B
Q
C
Q
C
Q
D
Q
D
Same as Load Circuit 1.
Same as Load Circuit 1.
Same as Load Circuit 1.
Item From input to output
ƒ
A→Q IN to QA GND OUT OUT OUT OUT
max
B→Q 4.5V IN GND — OUT OUT OUT
A B R0 Q
Inputs Outputs
A→QA IN to QA GND OUT — — —
A→QD IN to QA GND — — — OUT
t
t
PLH
PHL
B→QB 4.5V IN GND — OUT — —
B→QC 4.5V IN GND — — OUT —
B→QD 4.5V IN GND — — — OUT
R
→Q** IN* to QA IN OUT OUT OUT OUT
0
Notes: * For initialized.
** Measured with each input and unused inputs at 4.5 V.
Q
A
Q
B
Q
C
D
Rev.3.00, Jul.15.2005, page 5 of 7
Page 6
HD74LS293
Waveforms 1
, t
PLH
, t
PHL
Clock
A
Q
Q
B
Q
C
ƒ
max
, (Clock→Q)
10%
t
TLH
90%
90%
1.3 V
t
THL
t
PHL
t
PHL
t
PHL
t
PHL
10%
(Measure at tn+2)
1.3 V
(Measure at tn+4)
1.3 V
(Measure at tn+8)
1.3 V
(Measure at tn+16)
1.3 V
t
(Measure at tn+1)
PLH
1.3 V
t
(Measure at tn+2)
PLH
1.3 V
t
(Measure at tn+4)
PLH
1.3 V
t
(Measure at tn+8)
PLH
V
V
V
V
V
V
3V
0V
OH
OL
OH
OL
OH
OL
Q
D
1.3 V
Notes: 1. Clock input pulse; t
and : for ƒ
max
, t
TLH
= t
TLH
THL
≤ 15 ns, t
≤ 2.5 ns.
≤ 6 ns, PRR = 1 MHz, duty cycle = 50%
THL
2. tn is reference bit time when all outputs are low.
Waveforms 2
, (R
t
PHL
→Q)
0
R
0
QA to Q
t
TLH
90%
1.3 V
10%
t
w
t
PHL
D
90%
1.3 V
≥ 15ns
1.3 V
t
THL
10%
Note: t
≤ 15 ns, t
TLH
≤ 5 ns
THL
1.3 V
3 V
0 V
V
V
OH
OL
V
OH
V
OL
Rev.3.00, Jul.15.2005, page 6 of 7
Page 7
HD74LS293
Package Dimensions
RENESAS CodeJEITA Package Code Previous Code
PRDP0014AB-BP-DIP14-6.3x19.2-2.54
DP-14AV
D
814
MASS[Typ.]
E
0.97g
1
Z
e
b
3
b
p
7
Dimension in Millimeters
Reference
1
A
LA
θ
c
e
1
( Ni/Pd/Au plating )
Symbol
e
1
D
E
A
0.51
A
1
b
0.40 0.48
p
b
3
c
0.19 0.25 0.31
0
θ
e
2.29 2.54 2.79
Z
L
2.54
°
7.62
19.2
1.30
MaxNomMin
20.32
6.3
7.4
5.06
0.56
15
°
2.39
Rev.3.00, Jul.15.2005, page 7 of 7
Page 8
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