© 1999 Scenix Semiconductor, Inc. All rights reserved. - 37 - www.scenix.com SX18AC  / SX20AC / SX28AC 17.2 DC Characteristics Operating Temperature 0° C <= Ta <= +70° C (Commercial) Symbol Parameter Conditions Min Typ Max Units V_dd Supply Voltage RC
XT
HS LP 3.3
3.3
3.3
3.3 – 6.25
6.25
6.25
6.25 V
V
V
V V_por V_dd start voltage to ensure
Power-On Reset – V_ss – – V S_Vdd V_dd rise rate – 0.05 – – V/ms I_dd Supply Current, active V_dd = 5.0V, F_osc = 50 MHz V_dd = 5.0V, F_osc = 4 MHz internal V_dd = 3.3V, F_osc = 20 MHz -  60
7.5 21 – mA
mA
mA I_pd Supply Current, power down V_dd = 4.5V, WDT enabled V_dd = 4.5V, WDT disabled - TBD 50 – µA
µA V_ih, V_il Input Levels
MCLR, OSC1, RTCC Logic High Logic Low All Other Inputs
CMOS Logic High   Logic Low
TTL Logic High Logic Low 0.8V_dd V_ss 0.7V_dd V_ss 2.0
V_ss    V_dd
0.2V_dd    V_dd
0.3V_dd V_dd
0.8 V
V V
V V
V I_il Input Leakage Current V_in = V_dd or V_ss -1.0 +1.0 µA I_pup Weak Pullup Current V_dd = 5.5V, V_in = 0V V_dd = 3.3V, V_in = 0V 400
180 µA
µA V_oh Output High Voltage
OSC2, Ports B, C Port A Ioh = 20mA, Vdd = 4.5V
Ioh = 12mA, Vdd = 3.3V
Ioh = 30mA, Vdd = 4.5V
Ioh = 20mA, Vdd = 3.3V Vdd-0.7
Vdd-0.7
Vdd-0.7
Vdd-0.7 V
V
V
V V_ol Output Low Voltage
OSC2, All Ports I_ol = 30mA, Vdd = 4.5V Iol = 20mA, Vdd = 3.3V 0.6
0.6 V
V