Datasheet

7
TCA9548A
www.ti.com SCPS207F –MAY 2012–REVISED NOVEMBER 2016
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I
2
C Interface Timing Requirements (continued)
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 5)
MIN MAX UNIT
t
vdL(Data)
Valid-data time (high to low)
(2)
SCL low to SDA output low valid 1 μs
t
vdH(Data)
Valid-data time (low to high)
(2)
SCL low to SDA output high valid 0.6 μs
t
vd(ack)
Valid-data time of ACK condition
ACK signal from SCL low
to SDA output low
1 μs
C
b
I
2
C bus capacitive load 400 pF
6.7 Reset Timing Requirements
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER MIN MAX UNIT
t
W(L)
Pulse duration, RESET low 6 ns
t
REC(STA)
Recovery time from RESET to start 0 ns
(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) t
rst
is the propagation delay measured from the time the RESET pin is first asserted low to the time the SDA pin is asserted high,
signaling a stop condition. It must be a minimum of t
WL
.
6.8 Switching Characteristics
over recommended operating free-air temperature range, C
L
≤ 100 pF (unless otherwise noted) (see Figure 5)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
MIN MAX UNIT
t
pd
(1)
Propagation delay time
R
ON
= 20 Ω, C
L
= 15 pF
SDA or SCL SDn or SCn
0.3
ns
R
ON
= 20 Ω, C
L
= 50 pF 1
t
rst
(2)
RESET time (SDA clear) RESET SDA 500 ns