SN74LVC8T245-EP Datasheet, PDF (8/13 Pages) Texas Instruments – 8-BIT DUAL-SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS

SN74LVC8T245-EP
SCES770 – DECEMBER 2008........................................................................................................................................................................................... www.ti.com
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
C_L
(see Note A)
R_L
R_L
2 × V_CCO
S1
Open
GND
TEST
t_pd
t_PLZ/t_PZL
t_PHZ/t_PZH
S1
Open
2 × V_CCO
GND
LOAD CIRCUIT
V_CCO
1.8 V ± 0.15 V
2.5 V ± 0.2 V
3.3 V ± 0.3 V
5 V ± 0.5 V
C_L
15 pF
15 pF
15 pF
15 pF
R_L
2 kΩ
2 kΩ
2 kΩ
2 kΩ
V_TP
0.15 V
0.15 V
0.3 V
0.3 V
Input
t_w
V_CCI/2
V_CCI/2
VOLTAGE WAVEFORMS
PULSE DURATION
V_CCI
0V
Output
Control
(low-level
enabling)
V_CCA/2
V_CCA/2
V_CCA
0V
Input
t_PLH
Output
t_PZL
t_PLZ
V_CCI/2
V_CCI/2
V_CCI
0V
t_PHL
V_CCO/2
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
V_OH
V_CCO/2
V_OL
Output
Waveform 1
S1 at 2 × V_CCO
(see Note B)
Output
Waveform 2
S1 at GND
(see Note B)
t_PZH
V_CCO/2
V_CCO/2
V_OL + V_TP
t_PHZ
V_OH − V_TP
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
V_CCO
V_OL
V_OH
0V
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: PRRv10 MHz, Z_O = 50 Ω, dv/dt ≥ 1 V/ns.
D. The outputs are measured one at a time, with one transition per measurement.
E. t_PLZ and t_PHZ are the same as t_dis.
F. t_PZL and t_PZH are the same as t_en.
G. t_PLH and t_PHL are the same as t_pd.
H. V_CCI is the V_CC associated with the input port.
I. V_CCO is the V_CC associated with the output port.
J. All parameters and waveforms are not applicable to all devices.
Figure 1. Load Circuit and Voltage Waveforms
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