參數(shù)資料
型號(hào)： 7544
英文描述： 3.3V LDO POSITVE VOLTAGE REGULATOR 2% TOL.
中文描述： 7544Group數(shù)據(jù)表數(shù)據(jù)表503K/JUN.25.03
文件頁(yè)數(shù)： 5/54頁(yè)
文件大?。?/td> 503K
代理商： 7544
Rev.1.02 2003.06.25 page 5 of 53
7544 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
PIN DESCRIPTION
Table 1 Pin description
Pin
Vcc, Vss
V
REF
Function
Apply voltage of 4.0 to 5.5 V to Vcc, and 0 V to Vss.
Reference voltage input pin for A-D converter
Chip operating mode control pin, which is always connected to Vss.
Reset input pin for active
“
L
”
Input and output pins for main clock generating circuit
Connect a ceramic resonator or quartz-crystal oscillator between the X
IN
and X
OUT
pins.
For using RC oscillator, short between the X
IN
and X
OUT
pins, and connect the capacitor and resistor.
If an external clock is used, connect the clock source to the X
IN
pin and leave the X
OUT
pin open.
When the ring oscillator is selected as the main clock, connect X
IN
pin to V
CC
and leave X
OUT
open.
8-bit I/O port.
I/O direction register allows each pin to be individually pro-
grammed as either input or output.
CMOS compatible input level
CMOS 3-state output structure
P0 can output a large current for driving LED.
Whether a built-in pull-up resistor is to be used or not can be de-
termined by program.
5-bit I/O port
I/O direction register allows each pin to be individually pro-
grammed as either input or output.
CMOS compatible input level
CMOS 3-state output structure
CMOS/TTL level can be switched for P1
0
and P1
2
6-bit I/O port having almost the same function as P0
CMOS compatible input level
CMOS 3-state output structure
6-bit I/O port
I/O direction register allows each pin to be individually programmed as either input or output.
CMOS compatible input level (CMOS/TTL level can be switched for P3
4
and P3
7
).
CMOS 3-state output structure
P3 can output a large current for driving LED.
Whether a built-in pull-up resistor is to be used or not can be de-
termined by program.
Function expect a port function
Name
Power source
Analog reference
voltage
CNVss
Reset input
Clock input
I/O port P0
I/O port P1
CNVss
RESET
X
IN
P0
0
/CNTR
1
P0
1
P0
2
P0
3
/TX
OUT
P0
4
–
P0
7
Key-input (key-on wake up
interrupt input) pins
Timer X and timer A function
pin
P1
0
/RxD
P1
1
/TxD
P1
2
/S
____
P1
3
/S
RDY
P1
4
/CNTR
0
P2
0
/AN
0
–
P2
5
/AN
5
P3
0
–
P3
3
P3
4
/INT
1
P3
7
/INT
0
I/O port P2
I/O port P3
Serial I/O function pin
Timer X function pin
Input pins for A-D converter
Interrupt input pins
X
OUT
Clock output
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