SN74LVC4245A
OCTAL BUS TRANSCEIVER AND 3.3-V TO 5-V SHIFTER
WITH 3-STATE OUTPUTS
SCAS375H – MARCH 1994 – REVISED MARCH 2005
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PARAMETER MEASUREMENT INFORMATION
A PORT
2
×
V
CC
From Output
Under Test
C
L
= 50 pF
(see Note A)
500
Ω
S1
Open
TEST
GND
500
Ω
t
PLH
/t
PHL
t
PLZ
/t
PZL
t
PHZ
/t
PZH
S1
Open
2
×
V
CC
GND
LOAD CIRCUIT
t
w
V
CC
Input
1.5 V
1.5 V
0V
VOLTAGE WAVEFORMS
PULSE DURATION
Output
Control
t
PZL
V
CC
Input
t
PLH
Output
50% V
CC
50% V
CC
V
OL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
NONINVERTING OUTPUTS
1.5 V
1.5 V
0V
t
PHL
V
OH
Output
Waveform 1
S1 at 2
×
V
CC
(see Note B)
Output
Waveform 2
S1 at GND
(see Note B)
50% V
CC
t
PZH
50% V
CC
3V
1.5 V
1.5 V
0V
t
PLZ
V
CC
V
OL
+ 0.3 V
t
PHZ
V
OH
- 0.3 V
V
OH
≈0
V
V
OL
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
NOTES: A. C
L
includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low, except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high, except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR
≤
10 MHz, Z
O
= 50
Ω,
t
r
≤
2.5 ns, t
f
≤
2.5 ns.
D. The outputs are measured one at a time, with one transition per measurement.
E. All parameters and waveforms are not applicable to all devices.
Figure 1. Load Circuit and Voltage Waveforms
6
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