3-WIRE REAL-TIME CLOCK
S-35190A
Rev.2.4_00
AC Electrical Characteristics
VDD
Table 7 Measurement Conditions
Input pulse voltage
Input pulse rise/fall time
VIH = 0.8 × VDD, VIL = 0.2 × VDD
20 ns
R = 10 kΩ
Output determination voltage VOH = 0.8 × VDD, VOL = 0.2 × VDD
Output load 80 pF + pull-up resistor 10 kΩ
SIO
C = 80 pF
Remark The power supplies of the IC
and load have the same
electrical potential.
Figure 9 Output Load Circuit
Table 8 AC Electrical Characteristics
(Ta = −40 to +85°C)
VDD *2 ≥ 1.3 V
VDD *2 ≥ 3.0 V
Parameter
Symbol
Unit
Min.
5
1
1
1
Typ.
−
−
−
−
Max.
250000
Min.
1
0.2
0.2
0.2
0.2
−
0.2
0.2
−
Typ.
−
−
−
−
−
−
−
−
Max.
Clock pulse width
tSCK
tDS
tCSH
tISU
250000
µs
µs
µs
µs
µs
µs
µs
µs
µs
Setup time before CS rise
Hold time after CS rise
Input data setup time
Input data hold time
−
−
−
−
−
−
−
1
−
−
0.05
tIHO
tACC
tCSS
tDH
1
−
1
1
−
−
−
−
−
3.5
−
−
0.1
Output data definition time *1
Setup time before CS fall
Hold time after CS fall
Input rise/fall time
tR, tF
−
−
−
*1. Since the output format of the SIO pin is Nch open-drain output, output data definition time is determined by the values
of the load resistance (RL) and load capacity (CL) outside the IC. Therefore, use this value only as a reference value.
*2. Regarding the power supply voltage, refer to “ Recommended Operation Conditions”.
Seiko Instruments Inc.
7
SII [ SEIKO INSTRUMENTS INC ]
