HT48R50A-1/HT48C50-1
Pin Name
RES
VDD
I/O
I
¾
Options
¾
¾
Description
Schmitt trigger reset input. Active low
Positive power supply
OSC1, OSC2 are connected to an RC network or Crystal (determined by
option) for the internal system clock. In the case of RC operation, OSC2 is
the output terminal for 1/4 system clock. These two pins can also be
optioned as an RTC oscillator (32768Hz) or I/O lines. In these two cases,
the system clock comes from an internal RC oscillator whose frequency
has 4 options (3.2MHz, 1.6MHz, 800kHz, 400kHz). If the I/O option is se-
lected, the pull-high option can also be enabled or disabled. Otherwise the
PG1 and PG2 are used as internal registers (pull-high resistors are always
disabled).
Pull-high*
OSC1/PG1
OSC2/PG2
I
O
Crystal
or RC
or Int. RC+I/O
or Int. RC+RTC
Note: * The pull-high resistors of each I/O port (PA, PB, PC, PD, PG) are controlled by options.
Absolute Maximum Ratings
Supply Voltage ...........................V
SS
-0.3V
to V
SS
+6.0V
Input Voltage..............................V
SS
-0.3V
to V
DD
+0.3V
Storage Temperature ............................-50°C to 125°C
Operating Temperature...........................-40°C to 85°C
Note: These are stress ratings only. Stresses exceeding the range specified under
²Absolute
Maximum Ratings² may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
D.C. Characteristics
Symbol
Parameter
Test Conditions
V
DD
¾
¾
3V
5V
5V
3V
No load, system HALT
5V
3V
No load, system HALT
5V
3V
No load, system HALT
5V
¾
¾
¾
¾
¾
3V
I/O Port Sink Current
5V
¾
¾
¾
¾
LVR enabled
V
OL
=0.1V
DD
V
OL
=0.1V
DD
No load, f
SYS
=8MHz
Conditions
f
SYS
=4MHz
f
SYS
=8MHz
No load, f
SYS
=4MHz
Min.
2.2
3.3
¾
¾
¾
¾
¾
¾
¾
¾
¾
0
0.7V
DD
0
0.9V
DD
2.7
4
10
Typ.
¾
¾
1
2.5
4
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
3.0
8
20
Max.
5.5
5.5
2
5
8
5
10
1
2
5
10
0.3V
DD
V
DD
0.4V
DD
V
DD
3.3
¾
¾
Ta=25°C
Unit
V
V
mA
mA
mA
mA
mA
mA
mA
mA
mA
V
V
V
V
V
mA
mA
V
DD
Operating Voltage
Operating Current
(Crystal OSC, RC OSC)
Operating Current
(Crystal OSC, RC OSC)
Standby Current
(WDT OSC Enabled RTC Off)
Standby Current
(WDT OSC Disabled RTC Off)
Standby Current
(WDT OSC Disabled, RTC On)
Input Low Voltage for I/O Ports
Input High Voltage for I/O Ports
Input Low Voltage (RES)
Input High Voltage (RES)
Low Voltage Reset
I
DD1
I
DD23
I
STB1
I
STB2
I
STB3
V
IL1
V
IH1
V
IL2
V
IH2
V
LVR
I
OL
Rev. 2.01
4
January 9, 2009
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
