 English |
|
|
|
|
|
|
|
| 74HCT1284 Datasheet, PDF (6/12 Pages) NXP Semiconductors – Parallel printer interface transceiver/buffer | |||
| |||
| ◁ |
Philips Semiconductors
Parallel printer interface transceiver/buffer
Product specification
74HCT1284
TEST CIRCUITS AND WAVEFORM
VCC
D.U.T
IO
VOH/2
VOH is the voltage when 10µA is drawn from the high output.
IO is measured by forcing VOH/2 on the output. RD can then
be calculated using the equation RD = |VOH/2IO| .
SK00007
Figure 1. Output Impedance RD
VCC
PULSE
GENERATOR
VIN
RT
D.U.T
VOUT
35W
Test Circuit for Bn or Yn Outputs
50pF
S1
62W
VCC
GND
SWITCH POSITION
Bn or Yn Outputs
TEST SWITCH
tPLH
tPHL
tPZH
tPHZ
tPZL
tPLZ
GND
VCC
GND
GND
VCC
VCC
VCC
VIN
PULSE
GENERATOR
D.U.T
VOUT
RT
CL
RL
Test Circuit for An Outputs
DEFINITIONS
RL = Load resistor; see AC CHARACTERISTICS for value.
CL = Load capacitance includes jig and probe capacitance;
see AC CHARACTERISTICS for value.
RT = Termination resistance should be equal to ZOUT of
pulse generators.
90%
NEGATIVE
PULSE
POSITIVE
PULSE
10%
VM
10%
tW
VM
10%
tTHL (tf)
tTLH (tr)
90%
VM
90%
VM
tW
VM = 1.5V
Input Pulse Definition
90%
AMP (V)
0V
tTLH (tr)
tTHL (tf)
AMP (V)
10%
0V
FAMILY
74HCT
INPUT PULSE REQUIREMENTS
Amplitude Rep. Rate tW
tr
tf
3.0V
1MHz 500ns 3ns 3ns
SK00008
1998 Jul 10
6
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese