DS4550 Datasheet, PDF (3/18 Pages) Dallas Semiconductor – I2C and JTAG Nonvolatile 9-Bit I/O Expander Plus Memory

I²C and JTAG Nonvolatile 9-Bit I/O
Expander Plus Memory
AC ELECTRICAL CHARACTERISTICS-–I²C Interface (See Figure 5)
(V_CC = +2.7V to +5.5V, T_A = -40°C to +85°C, unless otherwise noted. Timing referenced to V_IL(MAX) and V_IH(MIN).)
PARAMETER
SCL Clock Frequency
Bus Free Time Between Stop and
Start Conditions
SYMBOL
f_SCL (Note 4)
t_BUF
CONDITIONS
MIN TYP MAX
0
400
1.3
Hold Time (Repeated) Start
Condition
Low Period of SCL
High Period of SCL
Data Hold Time
Data Setup Time
Start Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
Stop Setup Time
SDA and SCL Capacitive
Loading
EEPROM Write Time
t_HD:STA (Note 5)
t_LOW
t_HIGH
t_HD:DAT
t_SU:DAT
t_SU:STA
t_R
(Note 6)
t_F
(Note 6)
t_SU:STO
C_B
(Note 6)
t_WR
I²C EEPROM write (Note 7)
0.6
1.3
0.6
0
0.9
100
0.6
20 +
0.1C_B
300
20 +
0.1C_B
300
0.6
400
10
20
UNITS
kHz
µs
µs
µs
µs
µs
ns
µs
ns
ns
µs
pF
ms
AC ELECTRICAL CHARACTERISTICSJTAG Interface (See Figure 1)
(V_CC = +2.7V to +5.5V, T_A = -40°C to +85°C, unless otherwise noted.)
PARAMETER
TCK Clock Period
TCK Clock High/Low Time
TCK to TDI, TMS Setup Time
TCK to TDI, TMS Hold Time
TCK to TDO Delay
TCK to TDO High-Z Delay
EEPROM Write Time
SYMBOL
t₁
t₂, t₃
t₄
t₅
t₆
t₇
t_WR
(Note 8)
CONDITIONS
JTAG EEPROM write (Note 9)
MIN TYP
1000
50
500
15
10
10
MAX
50
50
20
UNITS
ns
ns
ns
ns
ns
ns
ms
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