TCA6424 Datasheet, PDF (20/29 Pages) Texas Instruments – LOW-VOLTAGE 24-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS

TCA6424
LOW-VOLTAGE 24-BIT I²C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
SCPS175 – NOVEMBER 2007
PARAMETER MEASUREMENT INFORMATION (continued)
V_CCI
INT
DUT
R_L = 4.7 kW
C_L = 100 pF
(see Note A)
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INTERRUPT LOAD CONFIGURATION
Start
Condition
Slave Address
ACK
From Slave
R/W
8 Bits
(One Data Byte)
From Port
ACK
From Slave
Data From Port
S
0
1
0
0
0
1
AD
DR
1
A
Data 1
A
Data 2
1P
12 34 567 8A
t_ir
INT
A
t_ir
B
B
Data
Into
Port
INT
t_iv
A
A
Address
0.5 ´ V_CCI
Data 1
SCL
R/W
t_sps
A
Data 2
0.7 ´ V_CCI
t_iv
Pn
0.5 ´ V_CCP
INT
t_ir
0.5 ´ V_CCI
View A−A
View B−B
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. All parameters and waveforms are not applicable to all devices.
Figure 11. Interrupt Load Circuit and Voltage Waveforms
20
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