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PT7C4339 Datasheet, PDF (4/22 Pages) Pericom Semiconductor Corporation – Real-time Clock Module
PT7C4339/4339C
Real-time Clock Module
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AC Electrical Characteristics
Sym
Description
VHM
Rising and falling threshold voltage high
VHL
Rising and falling threshold voltage low
Value
0.8 VCC
0.2 VCC
Unit
V
V
Signal
tf
Over the operating range (Figure 1)
Symbol
Item
fSCL
SCL clock frequency
tSU;STA
START condition set-up time
tHD;STA
START condition hold time
tSU;DAT
Data set-up time (RTC read/write)
tHD;DAT1 Data hold time (RTC write)
tHD;DAT2 Data hold time (RTC read)
tSU;STO
STOP condition setup time
tBUF
Bus idle time between a START and STOP condition
tLOW
When SCL = "L"
tHIGH
When SCL = "H"
tr
Rise time for SCL and SDA
tf
Fall time for SCL and SDA
tSP*
Allowable spike time on bus
CB
Capacitance load for each bus line
CI/O *
I/O Capacitance (SDA, SCL)
TOSF
Oscillator Stop Flag (OSF) Delay
* Note: only reference for design
VHM
VLM
tr
Min.
Typ.
Max.
Unit
-
-
400
kHz
0.6
-
-
s
0.6
-
-
s
200
-
-
ns
35
-
-
ns
0
-
-
s
0.6
-
-
s
1.3
-
-
s
1.3
-
-
s
0.6
-
-
s
-
-
0.3
s
-
-
0.3
s
-
-
50
ns
-
-
400
pF
-
-
10
pF
-
-
100
ms
S
SCL
SDA
tHD;STA
tLOW
fSCL
tSU;DAT
tHIGH
tHD;DAT
Sr
tHD;STA
tSU;STA
P
tSU;STA
tSP
tBUF
tSU;STO
tHD;STA
S Start condition
Sr Restart condition
P Stop condition
Figure1 I2C Timing
2015-08-0008
PT0508-1 08/24/15
4