TCA9538 Datasheet, PDF (12/37 Pages) Texas Instruments – Low Voltage 8-Bit I2C and SMBus Low-Power I/O Expander

TCA9538
SCPS199C – AUGUST 2014 – REVISED OCTOBER 2015
Parameter Measurement Information (continued)
DUT
Pn
C_L = 50 pF
(see Note A)
500 Ω
500 Ω
2 × V_CC
P-PORT LOAD CONFIGURATION
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SCL
SDA
P_n
0.7 × V_CC
P0
A
P3
0.3 × V_CC
Slave
ACK
t_pv
(see Note B)
Unstable
Data
Last Stable Bit
WRITE MODE (R/W = 0)
SCL
P0
A
P3
t_ph
t_ps
P_n
0.7 × V_CC
0.3 × V_CC
0.7 × V_CC
0.3 × V_CC
READ MODE (R/W = 1)
A. C_L includes probe and jig capacitance.
B. All inputs are supplied by generators having the following characteristics: PRR ≤ 10 MHz, Z_O = 50 Ω, t_r/t_f ≤ 30 ns.
C. The outputs are measured one at a time, with one transition per measurement.
D. All parameters and waveforms are not applicable to all devices.
Figure 11. P-Port Load Circuit and Voltage Waveforms
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