Specifications

Si2457/34/15/04
Rev. 1.3 7
Table 5. Absolute Maximum Ratings
Parameter Symbol Value Unit
DC Supply Voltage V
D
4.1 V
Input Current, Si2457/34/15/04 Digital
Input Pins
I
IN
±10 mA
Digital Input Voltage V
IND
–0.3 to (V
D
+ 0.3) V
CLKIN/XTALI Input Voltage V
XIND
–0.3 to (V
D
+ 0.3) V
Operating Temperature Range T
A
–10 to 100 °C
Storage Temperature Range T
STG
–40 to 150 °C
Note: Permanent device damage may occur if the above absolute maximum ratings are exceeded. Functional operation
should be restricted to the conditions as specified in the operational sections of this data sheet. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 6. Switching Characteristics
1
(V
D
= 3.0 to 3.6 V, T
A
= 0 to 70 °C for F-grade, T
A
= –40 to 85 °C for G-grade)
Parameter Symbol Min Typ Max Unit
UART Timing Parameters
Baud Rate Accuracy t
BD
–1 — 1 %
Reset Timing Parameters
RESET
to RESET t
RS
5.0
2
——ms
RESET
to 1st AT Command t
AT
300 — — ms
Parallel Timing Parameters
Address Setup t
AS
15 — — ns
Address Hold t
AH
0——ns
WR
Low Pulse Width t
WL
50 — — ns
Write Data Setup Time t
WDSU
20 — — ns
Write Cycle Time t
WC
120 — — ns
Chip Select Setup t
CSS
10 — — ns
Chip Select Hold t
CSH
0——ns
RD
Low Pulse Width t
RL
50 — — ns
RD
Low to Data Driven Time t
RLDD
— — 20 ns
Data Hold t
DH
10 — — ns
RD
High to Hi-Z Time t
DZ
— — 30 ns
Notes:
1. All timing is referenced to the 50% level of the waveform. Input test levels are V
IH
=V
D
– 0.4 V, V
IL
=0.4V.
2. With 32.768 kHz clocking, allow 500 ms for the reset low-to-high minimum pulse on power-up and wake-from-power-
down conditions.