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PDF MAX7456 Data sheet ( Hoja de datos )
| Número de pieza | MAX7456 | |
| Descripción | Single-Channel Monochrome On-Screen Display | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-0576; Rev 0; 8/07
Single-Channel Monochrome On-Screen
Display with Integrated EEPROM
General Description
The MAX7456 single-channel monochrome on-screen
display (OSD) generator lowers system cost by elimi-
nating the need for an external video driver, sync sepa-
rator, video switch, and EEPROM. The MAX7456 serves
all national and international markets with 256 user-pro-
grammable characters in NTSC and PAL standards.
The MAX7456 easily displays information such as com-
pany logo, custom graphics, time, and date with arbi-
trary characters and sizes. The MAX7456 is preloaded
with 256 characters and pictographs and can be repro-
grammed in-circuit using the SPITM port.
The MAX7456 is available in a 28-pin TSSOP package
and is fully specified over the extended (-40°C to
+85°C) temperature range.
Applications
Security Switching Systems
Security Cameras
Industrial Applications
In-Cabin Entertainment
Consumer Electronics
Pin Configuration appears at end of data sheet.
SPI is a trademark of Motorola, Inc.
Features
♦ 256 User-Defined Characters or Pictographs in
Integrated EEPROM
♦ 12 x 18 Pixel Character Size
♦ Blinking, Inverse, and Background Control
Character Attributes
♦ Selectable Brightness by Row
♦ Displays Up to 16 Rows x 30 Characters
♦ Sag Compensation On Video-Driver Output
♦ LOS, VSYNC, HSYNC, and Clock Outputs
♦ Internal Sync Generator
♦ NTSC and PAL Compatible
♦ SPI-Compatible Serial Interface
♦ Delivered with Preprogrammed Character Set
Ordering Information
PART
PIN-PACKAGE LANGUAGE
PKG
CODE
MAX7456EUI+ 28 TSSOP-EP*
English/
Japanese
U28E-5
*EP = Exposed pad.
+Denotes a lead-free package.
Note: This device is specified over the -40°C to +85°C operat-
ing temperature range.
Simplified Functional Diagram
VIN
CLKIN
XFB
CLKOUT
HSYNC
VSYNC
LOS
CS
SCLK
SDIN
SDOUT
RESET
AVDD
AGND
DVDD
DGND
PVDD
PGND
CLAMP
XTAL
OSCILLATOR
SYSTEM
SYNC
CLOCK SEPARATOR
OSD VIDEO
MUX DRIVER
DAC
SERIAL
INTERFACE
VIDEO
TIMING
GENERATOR
DISPLAY
ADDRESS
SYNC
DISPLAY
MEMORY
(SRAMS)
CHARACTER
ADDRESS
MAX7456
CHARACTER
MEMORY
(NVM)
PIXEL
CODE
SAG
NETWORK
OSD
GENERATOR
PIXEL
CONTROL
POR
VOUT
SAG
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Free Datasheet http://www.datasheet4u.com/
1 page  
Single-Channel Monochrome On-Screen
Display with Integrated EEPROM
TIMING CHARACTERISTICS (continued)
(VAVDD = +4.75V to +5.25V, VDVDD = +4.75V to +5.25V, VPVDD = +4.75V to +5.25V, TA = TMIN to TMAX. Typical values are at VAVDD
= VDVDD = VPVDD = +5V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
VOUT Sync to VSYNC Rising
Edge Delay
NTSC external sync mode, Figure 4
tVOUT-VSR PAL external sync mode, Figure 6
400
ns
425
VSYNC Falling Edge to VOUT
Sync Delay
NTSC internal sync mode, Figure 5
tVSF-VOUT PAL internal sync mode, Figure 7
40
ns
45
VSYNC Rising Edge to VOUT
Sync Delay
NTSC internal sync mode, Figure 5
tVSR-VOUT PAL internal sync mode, Figure 7
32
ns
30
VOUT Sync to HSYNC Falling
Edge Delay
tVOUT-HSF
NTSC and PAL external sync mode,
Figure 8
310 ns
VOUT Sync to HSYNC Rising
Edge Delay
tVOUT-HSR
NTSC and PAL external sync mode,
Figure 8
325 ns
HSYNC Falling Edge to VOUT
Sync Delay
tHSF-VOUT
NTSC and PAL internal sync mode,
Figure 9
115 ns
HSYNC Rising Edge to VOUT
Sync Delay
tHSR-VOUT
NTSC and PAL internal sync mode,
Figure 9
115 ns
All Supplies High to CS Low
tPUD Power-up delay
50 ms
NVM Write Busy
tNVW
12 ms
Note 1: See the standard test circuits of Figure 1. RL = 75Ω, unless otherwise specified. All digital input signals are timed from a
voltage level of (VIH + VIL) / 2. All parameters are tested at TA = +85°C and values through temperature range are guaran-
teed by design.
Note 2: The input-voltage operating range is the input range over which the output signal parameters are guaranteed (Figure 3).
Note 3: The input-voltage sync detection range is the input composite video range over which an input sync signal is properly
detected and the OSD signal appears at VOUT. However, the output voltage specifications are not guaranteed for input sig-
nals exceeding the maximum specified in the input operating voltage range (Figure 3).
SIGNAL
GEN
CIN
0.1µF
VIN
RIN
75Ω MAX7456
VOUT
MAX7456 SAG
CL RL
22pF 150Ω
a) INPUT TEST CIRCUIT
Figure 1. Standard Test Circuits
b) ONE STANDARD VIDEO LOAD, DC-COUPLED
_______________________________________________________________________________________ 5
5 Page 
Single-Channel Monochrome On-Screen
Display with Integrated EEPROM
MAXIMUM VIDEO SWING
WHITE LEVEL
VIN
COLOR BURST
INPUT VOLTAGE
SYNC TIP
LEVEL
BLACK LEVEL
Figure 3. Definition of Terms
MINIMUM VIDEO SWING
Input Clamp
The MAX7456’s clamp is a DC-restore circuit that uses
the input coupling capacitor to correct any DC shift of
the input signal, on a line-by-line basis, such that the
sync tip at VIN is approximately 550mV. This establish-
es a DC level at VIN suitable for the on-chip sync
detection and video processing functions. This circuitry
also removes low-frequency noise such as 60Hz hum
or other additive low-frequency noise.
Sync Separator
The sync separator detects the composite sync pulses
on the video input and extracts the timing information to
generate HSYNC and VSYNC. It is also used for inter-
nal OSD synchronization and loss-of-sync (LOS) detec-
tion. LOS goes high if no sync signal is detected at VIN
for 32 consecutive lines, and goes low if 32 consecu-
tive horizontal sync signals are detected. During a LOS
condition, when VM0[5] = 0 (Video Mode 0 register, bit
5), only the OSD appears at the VOUT. At this time, the
input image is set to a gray level at VOUT as deter-
mined by VM1[6:4]. The behavior of all sync modes is
shown in Table 1.
Table 1. Video Sync Modes
VIDEO MODE
Auto Sync Select Mode
VM0[5, 4] = 0x
External Sync Select
VM0[5, 4] = 10
Internal Sync Select
VM0[5, 4] = 11
X = Don’t care.
VIN
Video
No input
Video
No input
Video
No input
VSYNC
Active
Active
Active
Inactive (high)
Active
Active
HSYNC
Active
Active
Active
Inactive (high)
Active
Active
LOS
Low
High
Low
High
High
High
VOUT
VIN + OSD
OSD only
VIN + OSD
DC
OSD only
OSD only
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX7456.PDF ] | |
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