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MM74C925 Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # MM74C925
Description  4-Digit Counters with Multiplexed 7-Segment Output Drivers
PDF  8 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

MM74C925 Datasheet(HTML) 3 Page - National Semiconductor (TI)

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AC Electrical Characteristics TA e 25 C CL e 50 pF unless otherwise noted
Symbol
Parameter
Conditions
Min
Typ
Max
Units
fMAX
Maximum Clock Frequency
VCC e 5V
Tj e 25 C
2
4
MHz
Square Wave Clock
Tj e 100 C
15
3
MHz
tr tf
Maximum Clock Rise or Fall Time
VCC e 5V
15
m
s
tWR
Reset Pulse Width
VCC e 5V
Tj e 25 C
250
100
ns
Tj e 100 C
320
125
ns
tWLE
Latch Enable Pulse Width
VCC e 5V
Tj e 25 C
250
100
ns
Tj e 100 C
320
125
ns
tSET(CK LE)
Clock to Latch Enable Set-Up Time
VCC e 5V
Tj e 25 C
2500
1250
ns
Tj e 100 C
3200
1600
ns
tLR
Latch Enable to Reset Wait Time
VCC e 5V
Tj e 25 C0
b
100
ns
Tj e 100 C0
b
100
ns
tSET(R LE)
Reset to Latch Enable Set-Up Time
VCC e 5V
Tj e 25 C
320
160
ns
Tj e 100 C
400
200
ns
fMUX
Multiplexing Output Frequency
VCC e 5V
1000
Hz
CIN
Input Capacitance
Any Input (Note 2)
5
pF
AC Parameters are guaranteed by DC correlated testing
Functional Description
Reset
Asynchronous active high
Display Select
High displays output of counter
Low displays output of latch
Latch Enable
High flow through condition
Low latch condition
Clock
Negative edge sensitive
Segment Output
Current sourcing with 40 mA
VOUT e
VCC b 16V (typ) Also sink capability
e
2 LTTL loads
Digit Output
Current sourcing with 1 mA
VOUT e
175V Also sink capability e 2 LTTL
loads
Carry-Out
2 LTTL loads See carry-out waveforms
Typical Performance Characteristics
vs Output Voltage
Typical Segment Current
vs Ambient Temperature
Maximum Power Dissipation
Resistor Value
Current vs Segment
Typical Average Segment
TLF5919 – 3
Note
VD e Voltage across digit driver
3



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