Datasheet

DS4550
I
2
C and JTAG Nonvolatile 9-Bit I/O
Expander Plus Memory
_____________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS-–I
2
C 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
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SCL Clock Frequency f
SCL
(Note 4) 0
400
kHz
Bus Free Time Between Stop and
Start Conditions
t
BUF
1.3 µs
Hold Time (Repeated) Start
Condition
t
HD:STA
(Note 5) 0.6 µs
Low Period of SCL t
LOW
1.3 µs
High Period of SCL t
HIGH
0.6 µs
Data Hold Time
t
HD:DAT
0 0.9 µs
Data Setup Time
t
SU:DAT
100 ns
Start Setup Time t
SU:STA
0.6 µs
SDA and SCL Rise Time t
R
(Note 6)
20 +
0.1C
B
300
ns
SDA and SCL Fall Time t
F
(Note 6)
20 +
0.1C
B
300
ns
Stop Setup Time
t
SU:STO
0.6 µs
SDA and SCL Capacitive
Loading
C
B
(Note 6)
400
pF
EEPROM Write Time t
WR
I
2
C EEPROM write (Note 7) 10 20 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
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
TCK Clock Period t
1
1000
ns
TCK Clock High/Low Time t
2
, t
3
(Note 8) 50
500
ns
TCK to TDI, TMS Setup Time t
4
15 ns
TCK to TDI, TMS Hold Time t
5
10 ns
TCK to TDO Delay t
6
50 ns
TCK to TDO High-Z Delay t
7
50 ns
EEPROM Write Time t
WR
JTAG EEPROM write (Note 9) 10 20 ms