74F225 查看數據表（PDF） - Philips Electronics
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74F225 Datasheet PDF : 14 Pages
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Philips Semiconductors
16 × 5 asynchronous FIFO (3-State)
Product specification
74F225
APPLICATION
Load clock
NC
5–bit data input
CPA
CPB
UNCPOUT
IR
D0
D1
D2
D3
D4
MR
OR
UNCPIN
Q0
Q1
Q2
Q3
Q4
OE
Master reset
Input ready
5–bit data input
MR OE
CPA
OR
CPB
NC UNCPOUT UNCPIN
IR
D0
Q0
D1
Q1
D2
Q2
D3
Q3
D4
Q4
CPA
OR
CPB
UNCPOUT UNCPIN
NC IR
D0
Q0
D1
Q1
D2
Q2
D3
Q3
D4
Q4
MR OE
CPA
OR
CPB
UNCPOUT UNCPIN
NC IR
D0
Q0
D1
Q1
D2
Q2
D3
Q3
D4
Q4
MR OE
MR OE
CPA
OR
CPB
UNCPOUT UNCPIN
NC IR
D0
Q0
D1
Q1
D2
Q2
D3
Q3
D4
Q4
MR OE
CPA
OR
CPB
UNCPOUT UNCPIN
NC IR
D0
Q0
D1
Q1
D2
Q2
D3
Q3
D4
Q4
Figure 1. Expanding the 74F225 FIFO (48 words of 10 bits)
TEST CIRCUIT AND WAVEFORM
Output ready
Unload clock
5–bit data output
Output enable
5–bit data output
SF00345
VCC
VIN
PULSE
GENERATOR
VOUT
RL
D.U.T.
RT
CL RL
Test Circuit for Open Collector Outputs
SWITCH POSITION
TEST
tPLZ
tPZL
All other
SWITCH
closed
closed
open
7.0V
90%
NEGATIVE
PULSE
POSITIVE
PULSE
10%
tw
VM
10%
tTHL (tf )
VM
10%
tTLH (tr )
tTLH (tr )
90%
VM
tw
tTHL (tf )
90%
VM
Input Pulse Definition
90%
AMP (V)
0V
AMP (V)
10%
0V
DEFINITIONS:
RL = Load resistor;
see AC electrical characteristics for value.
CL = Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
RT = Termination resistance should be equal to ZOUT of
pulse generators.
INPUT PULSE REQUIREMENTS
family
amplitude VM rep. rate
tw
tTLH
74F
3.0V 1.5V 1MHz 500ns 2.5ns
tTHL
2.5ns
SF00128
June 15, 1992
10
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