4509 Datasheet, PDF (139/142 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4509 Group
VOLTAGE DROP DETECTION CIRCUIT CHARACTERISTICS
(Ta = –20 °C to 85 °C, unless otherwise noted)
Symbol
VRST^–
Parameter
Detection voltage
(reset occurs) (Note 2)
VRST+
Detection voltage
(reset release) (Note 3)
VRST+ – Detection voltage hysteresis
VRST^–
Test conditions
Ta = 25 °C
-20 °C ≤ Ta < 0 °C
0 °C ≤ Ta < 50 °C
50 °C ≤ Ta ≤ 85 °C
Ta = 25 °C
-20 °C ≤ Ta < 0 °C
0 °C ≤ Ta < 50 °C
50 °C ≤ Ta ≤ 85 °C
Limits
Unit
Min.
Typ.
Max.
2.6
V
2.5
3.1
2.2
3
2
2.7
2.7
V
2.6
3.2
2.3
3.1
2.1
2.8
0.1
V
IRST
Operation current (Note 4) VDD = 5 V
50
100
µA
TRST
Detection time (Note 5)
VDD = 3 V
VDD → (VRST^– – 0.1 V)
30
60
0.2
1.2
ms
Notes 1: The voltage drop detection circuit is equipped with only the M34509G4H.
2: The detection voltage (VRST^–) is defined as the voltage when reset occurs when the supply voltage (VDD) is falling.
3: The detection voltage (VRST+) is defined as the voltage when reset is released when the supply voltage (VDD) is rising from reset occurs.
4: In the M34509G4H, IRST is added to IDD (supply current).
5: The detection time (TRST) is defined as the time until reset occurs when the supply voltage (VDD) is falling to [VRST^– – 0.1 V].
Basic timing diagram
Parameter
Machine cycle
Mi
Pin name
System clock
STCK
Mi+1
Port output
Port input
Interrupt input
D0–D5
P00–P03
P10–P13
P20, P21
P30, P31
D0–D5
P00–P03
P10–P13
P20, P21
P30, P31
INT
Rev.1.02 2006.12.22 page 139 of 140
REJ03B0147-0102