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SN74AVC2T872_1 Datasheet, PDF (13/18 Pages) Texas Instruments – VOLTAGE-LEVEL SHIFTER FOR IC-USB INTERFACE
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SN74AVC2T872
www.ti.com........................................................................................................................................................................................... SCES710 – NOVEMBER 2008
PARAMETER MEASURMENT INFORMATION
From Output
Under Test
CL
(see Note A)
RL
RL
2 X VCCO
S1
Open
GND
TEST
tpd
tPLZ/tPZL
tPHZ/tPZH
S1
Open
2 X VCCO
GND
LOAD CIRCUIT
VCCO
1.2 V
1.5 V ± 0.1 V
1.8 V ± 0.15 V
2.5 V ± 0.2 V
3.3 V ± 0.3 V
CL
18 pF
18 pF
18 pF
18 pF
18 pF
RL
2 kΩ
2 kΩ
2 kΩ
2 kΩ
2 kΩ
VTP
0.1 V
0.1 V
0.15 V
0.15 V
0.3 V
Input
tPLH
Output
VCCI/2
VCCI/2
VCCI
0V
tPHL
VCCO/2
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOH
VCCO/2
VOL
90%
tr
90%
tf
VCCO
0V
Input
Output
Control
(low-level
enabling)
Output
Waveform 1
S1 at 2 X VCCO
(see Note B)
Output
Waveform 2
S1 at GND
(see Note B)
tw
VCCI/2
VCCI/2
VOLTAGE WAVEFORMS
PULSE DURATION
VCCA/2
VCCA/2
tPZL
tPLZ
tPZH
VCCO/2
VCCO/2
VOL + VTP
tPHZ
VOH - VTP
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
VCCI
0V
VCCA
0V
VCCO
VOL
VOH
0V
OUTPUT RISE AND FALL TIMES
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 ≤ 10 MHz, ZO = 50 W,
dv/dt ≥ 1 V/ns.
D. The outputs are measured one at a time, with one transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten. For the SN74AVC2T872, these delays are calculated per the Enable Times
forumulas shown in Table 1.
G. tPLH and tPHL are the same as tpd.
H. VCCI is the VCC associated with the input port.
I. VCCO is the VCC associated with the output port.
Figure 1. Load Circuit and Voltage Waveforms
Copyright © 2008, Texas Instruments Incorporated
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