WT8048
DPMS (Display Power Management
Signaling) Detector for Green Monitor
Aug. 31, 1995
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
DESCRIPTION
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
WT8048
2
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ORDERING INFORMATION
Part No.
Package
Description
WT8048
P-DIP 8L
OSC with 32768Hz Crystal
WT8048N1
P-DIP 8L
1. OSC with external resistor
2. With mute function
WT8048N2
P-DIP 8L
1. OSC with external resistor
2. Without mute function
*WT8048N3
P-DIP 8L
1. OSC with 3.58MHz resonator
2. With mute function
*WT8048N4
P-DIP 8L
1. OSC with 3.58MHz resonator
2. Without mute function
Note: "*" means "not available".
PIN CONFIGURATION
2
3
4
5
6
7
8
1
HIN
VIN
OSC
VSS
VDD
OFF
STD_BY +
SUSPEND
MUTE
WT8048N1 / N3
2
3
4
5
6
7
8
1
HIN
VIN
OSC
VSS
VDD
OFF
SUSPEND
STD_BY
WT8048 / N2 / N4
WT8048
3
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ABSOLUTE MAXIMUM RATING
ITEM
SYMBOL
VALUE
UNIT
Digital Supply Voltage
V
DD
5.5
V
Horizontal Sync. Input Voltage
V
HS
V
DD
(5)+0.3
V
PP
Vertical Sync. Input Voltage
V
VS
V
DD
(5)+0.3
V
PP
Power dissipation
P
D
30
mW
Operating Temperature Range
T
OPT
0
70
J
Storage Temperature Range
T
STG
-40
125
J
RECOMMENDED OPERATING CONDITIONS
ITEM
SYMBOL
MIN.
TYP.
MAX.
UNIT
Digital Supply Voltage
V
DD
(5)
4.5
5
5.5
V
Supply Current (Stand-by)
I
P
1
mA
Synchronous Input Voltage Low
V
IL
0.8
V
PP
Synchronous Input Voltage High
V
IH
2.4
4
5.5
V
PP
WT8048
4
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ELECTRICAL CHARACTERISTICS
A. WT8048
(V
DD
=5V, T
OPT
=24 J, F
OSC
=32768Hz)
ITEM
SYMBOL
MIN.
TYP.
MAX.
UNIT
Input Current (H
IN
, V
IN
), when V
IN
=5V
I
IN1
5
gA
Open Drain Output Low, when I
OL
= 6mA
V
OL
0.4
V
PP
Open Drain Sink Current, when V
OL
= 0.4V
V
OL
6
mA
Input Current (OSC), when V
IN
= 5V
I
IN3
5
gA
B. WT8048N1 / N2
(V
DD
=5V, T
OPT
=24 J, F
OSC
= 450KHz)
ITEM
SYMBOL
MIN.
TYP.
MAX.
UNIT
Input Current (H
IN
, V
IN
), when V
IN
=5V
I
IN1
5
gA
Open Drain Output Low, when I
OL
= 6mA
V
OL
0.4
V
PP
Open Drain Sink Current, when V
OL
= 0.4V
V
OL
6
mA
Input Current (OSC), when V
IN
= 5V
I
IN3
15
mA
C. WT8048N3 / N4
(V
DD
=5V, T
OPT
=24 J, F
OSC
= 3.58MHz)
ITEM
SYMBOL
MIN.
TYP.
MAX.
UNIT
Input Current (H
IN
, V
IN
), when V
IN
=5V
I
IN1
5
gA
Open Drain Output Low, when I
OL
= 6mA
V
OL
0.4
V
PP
Open Drain Sink Current, when V
OL
= 0.4V
V
OL
6
mA
Input Current (OSC), when V
IN
= 5V
I
IN3
5
gA
WT8048
5
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PIN DESCRIPTION
Pin No.
WT8048N1
/N3
WT8048/
N2/N4
Name
Function
Structure
of
Terminal
1
1
H
SIN
Input terminal of horizontal
synchronous signal
Input,
TTL compatible
2
2
V
SIN
Input terminal of vertical
synchronous signal
Input,
TTL compatible
3
3
OSC
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.
Input
4
4
V
SS
Ground
5
STD_BY
Indicate in Stand_By mode
Output, open drain
5
Mute
Indicate in Mute mode
6
Suspend
Indicate in Suspend mode
Output, open drain
6
Suspend
+
STD_BY
Indicate in Suspend and stand_By
mode
7
7
Off
Indicate in Off mode
Output, open drain
8
8
V
DD
5 volts power supply
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