WT8048
eltrend
DESCRIPTION
DPMS (Display Power Management
Signaling) Detector for Green Monitor
Aug. 31, 1995
The WT8048 is a 8 pin P-DIP package IC, designed for the application of Power Saving
Monitor or Green Monitor.
As per DPMS proposal, the WT8048 provides a detective circuit of monitor power
management for the convenience of designers in designing Power Saving Monitor.
FEATURES
{
Accepting two seperated H&V synchronous signals with positive/ negative polarity.
{
Capable of processing horizontal frequency between 0Hz to 100kHz, and vertical
frequency between 0Hz to 100Hz.
{
Power Saving mode - It can detect the conditions of monitor to decide which will be
selected as following: ON mode / STAND_BY mode / SUSPEND mode / OFF mode.
{
An Override mode is defined to override the DPMS function during the design, test,
burn-in manufacture or diagnostic process if desired.
APPLICATION
{
DPMS mode's detection for Green Monitor
Weltrend Semiconductor, Inc.
2F., No. 24, Ind. E. 9th Rd., Science-Based Ind. Park,
Hsin-Chu, Taiwan, R. O. C.
Tel: 886-35-780241 Fax: 886-35-7704191
eltrend
ORDERING INFORMATION
Part No.
WT8048
WT8048N1
WT8048N2
*WT8048N3
*WT8048N4
Package
P-DIP 8L
P-DIP 8L
P-DIP 8L
P-DIP 8L
P-DIP 8L
WT8048
Description
OSC with 32768Hz Crystal
1. OSC with external resistor
2. With mute function
1. OSC with external resistor
2. Without mute function
1. OSC with 3.58MHz resonator
2. With mute function
1. OSC with 3.58MHz resonator
2. Without mute function
Note: "*" means "not available".
PIN CONFIGURATION
WT8048N1 / N3
HIN
1
8
VDD
HIN
WT8048 / N2 / N4
1
8
VDD
VIN
2
7
OFF
STD_BY +
SUSPEND
MUTE
VIN
2
7
OFF
OSC
3
6
OSC
3
6
SUSPEND
VSS
4
5
VSS
4
5
STD_BY
2
eltrend
ABSOLUTE MAXIMUM RATING
ITEM
Digital Supply Voltage
Horizontal Sync. Input Voltage
Vertical Sync. Input Voltage
Power dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
DD
V
HS
V
VS
P
D
T
OPT
T
STG
VALUE
5.5
V
DD
(5)+0.3
V
DD
(5)+0.3
30
0¡
ã
0
7
-40¡
ã
25
1
WT8048
UNIT
V
V
PP
V
PP
mW
¢ J
¢ J
RECOMMENDED OPERATING CONDITIONS
ITEM
Digital Supply Voltage
Supply Current (Stand-by)
Synchronous Input Voltage Low
Synchronous Input Voltage High
SYMBOL
V
DD
(5)
I
P
V
IL
V
IH
MIN.
4.5
TYP.
5
MAX.
5.5
1
0.8
5.5
UNIT
V
mA
V
PP
V
PP
2.4
4
3
eltrend
ELECTRICAL CHARACTERISTICS
A. WT8048
(V
DD
=5V, T
OPT
=24¢
J
F
OSC
=32768Hz)
,
WT8048
ITEM
Input Current (H
IN
, V
IN
), when V
IN
=5V
Open Drain Output Low, when I
OL
= 6mA
Open Drain Sink Current, when V
OL
= 0.4V
Input Current (OSC), when V
IN
= 5V
SYMBOL MIN.
I
IN1
V
OL
V
OL
I
IN3
TYP.
MAX. UNIT
5
£ g
A
0.4
V
PP
6
mA
5
£ g
A
B. WT8048N1 / N2
(V
DD
=5V, T
OPT
=24¢
J
F
OSC
= 450KHz)
,
ITEM
Input Current (H
IN
, V
IN
), when V
IN
=5V
Open Drain Output Low, when I
OL
= 6mA
Open Drain Sink Current, when V
OL
= 0.4V
Input Current (OSC), when V
IN
= 5V
SYMBOL MIN.
I
IN1
V
OL
V
OL
I
IN3
TYP.
MAX. UNIT
5
£ g
A
0.4
V
PP
6
mA
15
mA
C. WT8048N3 / N4
(V
DD
=5V, T
OPT
=24¢
J
F
OSC
= 3.58MHz)
,
ITEM
Input Current (H
IN
, V
IN
), when V
IN
=5V
Open Drain Output Low, when I
OL
= 6mA
Open Drain Sink Current, when V
OL
= 0.4V
Input Current (OSC), when V
IN
= 5V
SYMBOL MIN.
I
IN1
V
OL
V
OL
I
IN3
TYP.
MAX. UNIT
5
£ g
A
0.4
V
PP
6
mA
5
£ g
A
4
eltrend
PIN DESCRIPTION
Pin No.
WT8048N1
/N3
WT8048/
N2/N4
WT8048
Name
H
SIN
V
SIN
OSC
Function
Input terminal of horizontal
synchronous signal
Input terminal of vertical
synchronous signal
A clock generator circuit is built
into the chip. So, if a resonator is
connected to OSC pin and
ground, a clock signal can be
obtained.
Ground
Indicate in Stand_By mode
Indicate in Mute mode
Indicate in Suspend mode
Indicate in Suspend and stand_By
mode
Indicate in Off mode
5 volts power supply
Structure
of
Terminal
Input,
TTL compatible
Input,
TTL compatible
Input
1
2
3
1
2
3
4
5
4
5
6
6
7
8
7
8
V
SS
STD_BY
Mute
Suspend
Suspend
+
STD_BY
Off
V
DD
Output, open drain
Output, open drain
Output, open drain
5
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