TCA6408_09 Datasheet, PDF (19/31 Pages) Texas Instruments – LOW-VOLTAGE 8-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS

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TCA6408
LOW-VOLTAGE 8-BIT I²C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
SCPS151C – FEBRUARY 2007 – REVISED JUNE 2007
PARAMETER MEASUREMENT INFORMATION (continued)
DUT
Pn
C_L = 50 pF
(see Note A)
500 W
500 W
2 ´ V_CCP
P PORT LOAD CONFIGURATION
SCL
SDA
Pn
0.7 ´ V_CCP
P0
A
P3
0.3 ´ V_CCI
Slave
ACK
t_pv
(see Note B)
Unstable
Data
Last Stable Bit
WRITE MODE (R/W = 0)
SCL
Pn
P0
t_ps
A
P3
t_ph
0.7 ´ V_CCI
0.3 ´ V_CCI
0.5 ´ V_CCP
READ MODE (R/W = 1)
A. C_L includes probe and jig capacitance.
B. t_pv is measured from 0.7 × V_CC on SCL to 50% I/O (Pn) output.
C. All inputs are supplied by generators having the following characteristics: PRR ≤ 10 MHz, Z_O = 50 Ω, t_r/t_f ≤ 30 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 12. P Port Load Circuit and Timing Waveforms
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