sn74lv245at octal bus transceiver with 3state outputs - CNC4PC

SCLS605A − DECEMBER 2004 − MARCH 2005
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
CL
(see Note A)
Test
Point
From Output
Under Test
CL
(see Note A)
RL = 1 kΩ
S1
VCC
Open
GND
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open Drain
S1
Open
VCC
GND
VCC
LOAD CIRCUIT FOR
TOTEM-POLE OUTPUTS
LOAD CIRCUIT FOR
3-STATE AND OPEN-DRAIN OUTPUTS
Input
tw
1.5 V 1.5 V
3 V
0 V
Timing Input
Data Input
tsu
1.5 V
th
1.5 V 1.5 V
3 V
0 V
3 V
0 V
VOLTAGE WAVEFORMS
PULSE DURATION
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Input
1.5 V 1.5 V
3 V
0 V
Output
Control
1.5 V 1.5 V
3 V
0 V
In-Phase
Output
Out-of-Phase
Output
tPLH
tPHL
50% VCC
50% VCC
tPHL
VOH
50% VCC
VOL
tPLH
VOH
50% VCC
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
Output
Waveform 1
S1 at VCC
(see Note B)
Output
Waveform 2
S1 at GND
(see Note B)
tPZL
tPZH
50% VCC
50% VCC
tPLZ
VOL + 0.3 V
VOL
tPHZ
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
≈VCC
VOH
VOH − 0.3 V
≈0 V
NOTES: A. CL 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 ≤ 1 MHz, ZO = 50 Ω, tr ≤ 3 ns, tf ≤ 3 ns.
D. The outputs are measured one at a time, with one input transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPHL and tPLH are the same as tpd.
H. All parameters and waveforms are not applicable to all devices.
Figure 1. Load Circuit and Voltage Waveforms
6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265