TCA9545A Datasheet, PDF (7/30 Pages) Texas Instruments – Low Voltage 4-channel I2C and SMbus Switch With Interrupt Logic and Reset Functions

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TCA9545A
SCPS204B – JANUARY 2014 – REVISED MARCH 2014
7.7 Switching Characteristics
over recommended operating free-air temperature range, C_L ≤ 100 pF (unless otherwise noted) (see Figure 7)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
MIN MAX
UNIT
t_pd ⁽¹⁾
t_iv
t_ir
Propagation delay time
Interrupt valid time⁽²⁾
Interrupt reset delay time⁽²⁾
R_ON = 20 Ω, C_L = 15 pF
R_ON = 20 Ω, C_L = 50 pF
SDA or SCL
INTn
INTn
SDn or SCn
INT
INT
0.3
ns
1
4 μs
2 μs
(1) The propagation delay is the calculated RC time constant of the typical ON-state resistance of the switch and the specified load
capacitance, when driven by an ideal voltage source (zero output impedance).
(2) Data taken using a 4.7-kΩ pullup resistor and 100-pF load (see Figure 7)
7.8 Interrupt and Reset Timing Requirements
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 7)
PARAMETER
MIN MAX UNIT
t_PWRL
t_PWRH
t_WL
t_rst ⁽¹⁾
t_REC(STA)
Low-level pulse duration rejection of INTn inputs
High-level pulse duration rejection of INTn inputs
Pulse duration, RESET low
RESET time (SDA clear)
Recovery time from RESET to start
1
μs
0.5
μs
6
ns
500 ns
0
ns
(1) t_rst is the propagation delay measured from the time the RESET terminal is first asserted low to the time the SDA terminal is asserted
high, signaling a stop condition. It must be a minimum of t_WL.
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