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DM74S161N

P1-P3P4-P6P7-P7
www.fairchildsemi.com 4
DM74S161 • DM74S163
Parameter Measurement Information
Switching Time Waveforms
Note A:The input pulses are supplied by generators having the following characteristics:
PRR ≤ 1 MHz, duty cycle ≤ 50%, Z
OUT
≈ 50Ω. For DM74S161/163, t
r
≤ 2.5 ns, t
f
≤ 2.5 ns. Vary PRR to measure f
MAX
.
Note B: Outputs Q
D
and carry are tested at t
n
+ 16 for DM74S161, SM74S163 where t
n
is the bit time when all outputs are LOW
Note C: V
REF = 1.5V.
Switching Time Waveforms
Note A: The input pulses are supplied by generators having the following characteristics:
PRR ≤ 1 MHz, duty cycle ≤ 50%, Z
OUT
≈ 50Ω. t
r
≤ 2.5 ns, t
f
≤ 2.5 ns. Vary PRR to measure f
MAX
.
Note B: Enable P and enable T setup times are measured at t
n
+ 0.
Note C:V
REF
= 1.5V.
5 www.fairchildsemi.com
DM74S161 • DM74S163
Absolute Maximum Ratings(Note 1)
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Note 2: C
L
= 15 pF, R
L
= 280Ω, T
A
= 25°C and V
CC
= 5V.
Note 3: C
L
= 50 pF, R
L
= 280Ω, T
A
= 25°C and V
CC
= 5V.
Note 4: Applies only to the DM74S163 which has synchronous clear inputs.
Note 5: Applies only to the DM74S161 which has asynchronous clear inputs.
Supply Voltage 7V
Input Voltage 5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°Cto+150°C
Symbol Parameter Min Nom Max Units
V
CC
Supply Voltage 4.75 5 5.25 V
V
IH
HIGH Level Input Voltage 2 V
V
IL
LOW Level Input Voltage 0.8 V
I
OH
HIGH Level Output Current −1mA
I
OL
LOW Level Output Current 20 mA
f
CLK
Clock Frequency (Note 2) 0 40
MHz
Clock Frequency (Note 3) 0 35
t
W
Pulse Width (Note 2) Clock 10 ns
Clear (Note 5) 10
Pulse Width (Note 3) Clock 12
Clear (Note 5) 12
t
SU
Setup Time (Note 2) Data 4 ns
Enable P or T 12
Load 14
Clear (Note 4) 14
Setup Time (Note 3) Data 5
Enable P or T 14
Load 16
Clear (Note 4) 16
t
H
Hold Time (Note 2) Data 3 ns
Others 0
Hold Time (Note 3) Data 5
Others 2
t
REL
Load or Clear Release Time (Note 2) 12
ns
Load or Clear Release Time (Note 3) 14
T
A
Free Air Operating Temperature 0 70 °C
www.fairchildsemi.com 6
DM74S161 • DM74S163
Electrical Characteristics
over recommended operating free air temperature (unless otherwise noted)
Note 6: All typicals are at V
CC
= 5V, T
A
= 25°C.
Note 7: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Switching Characteristics
at V
CC
= 5V and T
A
= 25°C
Note 8: Propagation delay for clearing is measured from clear input for the DM74S161 and from the clock input transition for the DM74S163.
Symbol Parameter Conditions Min
Typ
Max Units
(Note 6)
V
I
Input Clamp Voltage V
CC
= Min, I
I
= −18 mA −1.2 V
V
OH
HIGH Level V
CC
= Min, I
OH
= Max
2.7 3.4 V
Output Voltage V
IL
= Max, V
IH
= Min
V
OL
LOW Level V
CC
= Min, I
OL
= Max
0.5 V
Output Voltage V
IH
= Min, V
IL
= Max
I
I
Input Current @ Max Input Voltage V
CC
= Max, V
I
= 5.5V 1 mA
I
IH
LOW Level V
CC
= Max CLK, Data 50
µA
Input Current V
I
= 2.7V Others −10 −200
I
IL
LOW Level V
CC
= Max Enable T −4mA
Input Current V
I
= 0.5V Others −2
I
OS
Short Circuit Output Current V
CC
= Max (Note 7) −40 −100 mA
I
CC
Supply Current V
CC
= Max 95 160 mA
R
L
= 280Ω
Symbol Parameter From (Input)
C
L
= 15 pF C
L
= 50 pF
Units
To (Output) Min Max Min Max
f
MAX
Maximum Clock Frequency 40 35 MHz
t
PLH
Propagation Delay Time
Clock to Ripple Carry 25 25 ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Clock to Ripple Carry 25 28 ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time
Clock to Any Q 15 15 ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Clock to Any Q 15 18 ns
HIGH-to-LOW Level Output
t
PLH
Propagation Delay Time
Enable T to Ripple Carry 15 18 ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
Enable T to Ripple Carry 15 18 ns
HIGH-to-LOW Level Output
t
PHL
Propagation Delay Time
Clear to Any Q 20 24 ns
HIGH-to-LOW Level Output (Note 8)
P1-P3P4-P6P7-P7

DM74S161N

Mfr. #:
Buy DM74S161N
Manufacturer:
ON Semiconductor / Fairchild
Description:
Counter ICs Syn 4-Bit Binary Ctr
Lifecycle:
New from this manufacturer.
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