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DS64EV400 Datasheet, PDF (7/18 Pages) National Semiconductor (TI) – Programmable Quad Equalizer
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Electrical Characteristics — Serial Management Bus Interface
Over recommended operating supply and temperature ranges unless other specified.
Symbol
Parameter
Conditions
Min
Typ
SERIAL BUS INTERFACE DC SPECIFICATIONS
VIL
Data, Clock Input Low Voltage
VIH
Data, Clock Input High Voltage
2.1
IPULLUP
Current Through Pull-Up Resistor High Power Specification
4
or Current Source
VDD
ILEAK-Bus
ILEAK-Pin
CI
RTERM
Nominal Bus Voltage
Input Leakage Per Bus Segment (Note 10)
Input Leakage Per Device Pin
Capacitance for SDA and SDC (Note 10, 11)
External Termination Resistance VDD3.3,
pull to VDD = 2.5V ± 5% OR 3.3V ± (Note 10, 11, 12)
10%
VDD2.5,
(Note 10, 11, 12)
2.375
-200
-15
2000
1000
SERIAL BUS INTERFACE TIMING SPECIFICATIONS (Figure 7)
FSMB
Bus Operating Frequency
(Note 13)
10
TBUF
Bus Free Time Between Stop and
Start Condition
4.7
THD:STA
Hold time after (Repeated) Start At IPULLUP, Max
Condition. After this period, the first
4.0
clock is generated.
TSU:STA
Repeated Start Condition Setup
Time
4.7
TSU:STO Stop Condition Setup Time
4.0
THD:DAT Data Hold Time
300
TSU:DAT Data Setup Time
250
TTIMEOUT
Detect Clock Low Timeout
(Note 13)
25
TLOW
Clock Low Period
4.7
THIGH
Clock High Period
(Note 13)
4.0
TLOW:SEXT Cumulative Clock Low Extend
Time (Slave Device)
(Note 13)
tF
Clock/Data Fall Time
(Note 13)
tR
Clock/Data Rise Time
(Note 13)
tPOR
Time in which a device must be (Note 13)
operational after power-on reset
Max
0.8
VDD
3.6
+200
10
100
35
50
2
300
1000
500
Units
V
V
mA
V
µA
µA
pF
Ω
Ω
kHz
µs
µs
µs
µs
ns
ns
ms
µs
µs
ms
ns
ns
ms
Note 10: Recommended value. Parameter not tested in production.
Note 11: Recommended maximum capacitance load per bus segment is 400pF.
Note 12: Maximum termination voltage should be identical to the device supply voltage.
Note 13: Compliant to SMBus 2.0 physical layer specification. See System Management Bus (SMBus) Specification Version 2.0, section 3.1.1 SMBus common
AC specifications for details.
7
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