TCA9546A Datasheet, PDF (6/31 Pages) Texas Instruments – Low Voltage 4-Channel I2C and SMBus Switch with Reset Function

TCA9546A
SCPS205A – APRIL 2014 – REVISED FEBRUARY 2015
Electrical Characteristics⁽¹⁾ (continued)
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
R_ON
Switch on-state resistance
TEST CONDITIONS
V_O = 0.4 V
I_O = 15 mA
V_O = 0.4 V
I_O = 10 mA
V_CC
4.5 V to 5.5 V
3 V to 3.6 V
2.3 V to 2.7 V
1.65 V to 1.95 V
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MIN TYP⁽²⁾
4
10
5
13
7
16
10
25
MAX
16
20
45
70
UNIT
Ω
7.6 I²C Interface Timing Requirements
over recommended operating free-air temperature range (unless otherwise noted) (see Figure 5)
STANDARD MODE
I²C BUS
FAST MODE
I²C BUS
f_scl
t_sch
t_scl
t_sp
t_sds
t_sdh
t_icr
t_icf
t_ocf
t_buf
t_sts
t_sth
t_sps
t_vdL(Data)
t_vdH(Data)
t_vd(ack)
C_b
I²C clock frequency
I²C clock high time
I²C clock low time
I²C spike time
I²C serial-data setup time
I²C serial-data hold time
I²C input rise time
I²C input fall time
I²C output fall time
10-pF to 400-pF bus
I²C bus free time between stop and start
I²C start or repeated start condition setup
I²C start or repeated start condition hold
I²C stop condition setup
Valid-data time (high to low)⁽³⁾ SCL low to SDA output low valid
Valid-data time (low to high)⁽³⁾ SCL low to SDA output high valid
Valid-data time of ACK condition
I²C bus capacitive load
ACK signal from SCL low
to SDA output low
MIN
MAX
MIN MAX
0
100
0
400
4
0.6
4.7
1.3
50
50
250
100
0 ⁽¹⁾
0 ⁽¹⁾
1000 20 + 0.1C_b ⁽²⁾
300
300 20 + 0.1C_b ⁽²⁾
300
300 20 + 0.1C_b ⁽²⁾
300
4.7
1.3
4.7
0.6
4
0.6
4
0.6
1
1
0.6
0.6
1
1
400
400
UNIT
kHz
μs
μs
ns
ns
μs
ns
ns
ns
μs
μs
μs
μs
μs
μs
μs
pF
(1) A device internally must provide a hold time of at least 300 ns for the SDA signal (referred to the V_IH min of the SCL signal), in order to
bridge the undefined region of the falling edge of SCL.
(2) C_b = total bus capacitance of one bus line in pF
(3) Data taken using a 1-kΩ pullup resistor and 50-pF load (see Figure 5)
7.7 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
R_ON = 20 Ω, C_L = 50 pF
SDA or SCL
SDn or SCn
0.3
ns
1
(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).
6
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