MM5451BVT&R [MICREL]
LED Driver, 35-Segment, NMOS, PQCC44, PLASTIC, LCC-44;
| 型号： | MM5451BVT&R |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | LED Driver, 35-Segment, NMOS, PQCC44, PLASTIC, LCC-44 显示驱动器 |
| 文件： | 总9页 (文件大小：279K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MM5450/5451
LED Display Driver
General Description
Features
• Continuous brightness control
• Serial data input
• No load signal requirement
• Enable (on MM5450)
• Wide power supply operation
• TTL compatibility
• 34 or 35 outputs, 15mA capability
• Alphanumeric capability
The MM5450 and MM5451 LED display drivers are
monolithic MOS IC’s fabricated in an N-Channel, metal-
gate process. The technology produces low-threshold,
enhancement-mode, and ion-implanted depletion-mode
devices.
A single pin controls the LED display brightness by setting
a reference current through a variable resistor connected
to the supply.
Ordering Information
Applications
Part Number
Standard Pb-Free
Junction
Temp. Range
• Industrial control indicator
• Relay driver
Package
MM5450BN MM5450YN –40°C to+85°C 40-pin PDIP
MM5451BN MM5451YN –40°C to+85°C 40-pin PDIP
MM5450BV MM5450YV –40°C to+85°C 44-pin PLCC
MM5451BV MM5451YV –40°C to+85°C 44-pin PLCC
• Digital clock, thermometer, counter, voltmeter
• Instrumentation readouts
____________________________________________________________________________________________________________
Block Diagram
OUT 34
24
OUT 1
18
VDD
20
BRIGHTNESS
CONTROL
19
35 OUTPUT BUFFERS
35 LATCHES
LOAD
23
22
DATA ENABLE/OUT 35
(See Note 1)
35-BIT SHIFT
REGISTER
SERIAL DATA
RESET
RESET
(only available
in die form)
21
CLOCK
1
Note 1: Pin 23 is Data Enable in MM5450
Pin 23 is Output 35 in MM5451
Figure 1.
SuperSwitcher and Super ßeta PNP are trademarks of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-021606
(408) 955-1690
February 2006
Micrel, Inc.
MM5450/5451
Connection Diagram: Die
Figure 2.
Connection Diagram: Dual-in-line Package
V
V
SS
1
2
3
4
5
6
7
8
9
40 OUTPUT BIT 18
39 OUTPUT BIT 19
38 OUTPUT BIT 20
37 OUTPUT BIT 21
36 OUTPUT BIT 22
35 OUTPUT BIT 23
34 OUTPUT BIT 24
33 OUTPUT BIT 25
32 OUTPUT BIT 26
31 OUTPUT BIT 27
30 OUTPUT BIT 28
29 OUTPUT BIT 29
28 OUTPUT BIT 30
27 OUTPUT BIT 31
26 OUTPUT BIT 32
25 OUTPUT BIT 33
24 OUTPUT BIT 34
23 DATA ENABLE
22 DATA IN
1
2
3
4
5
6
7
8
9
40 OUTPUT BIT 18
SS
OUTPUT BIT 17
OUTPUT BIT 16
OUTPUT BIT 15
OUTPUT BIT 14
OUTPUT BIT 13
OUTPUT BIT 12
OUTPUT BIT 11
OUTPUT BIT 10
OUTPUT BIT 17
OUTPUT BIT 16
OUTPUT BIT 15
OUTPUT BIT 14
OUTPUT BIT 13
OUTPUT BIT 12
OUTPUT BIT 11
OUTPUT BIT 10
39 OUTPUT BIT 19
38 OUTPUT BIT 20
37 OUTPUT BIT 21
36 OUTPUT BIT 22
35 OUTPUT BIT 23
34 OUTPUT BIT 24
33 OUTPUT BIT 25
32 OUTPUT BIT 26
31 OUTPUT BIT 27
30 OUTPUT BIT 28
29 OUTPUT BIT 29
28 OUTPUT BIT 30
27 OUTPUT BIT 31
26 OUTPUT BIT 32
25 OUTPUT BIT 33
24 OUTPUT BIT 34
23 OUTPUT BIT 35
22 DATA IN
OUTPUT BIT 9 10
OUTPUT BIT 8 11
OUTPUT BIT 7 12
OUTPUT BIT 6 13
OUTPUT BIT 5 14
OUTPUT BIT 4 15
OUTPUT BIT 3 16
OUTPUT BIT 2 17
OUTPUT BIT 1 18
OUTPUT BIT 9 10
OUTPUT BIT 8 11
OUTPUT BIT 7 12
OUTPUT BIT 6 13
OUTPUT BIT 5 14
OUTPUT BIT 4 15
OUTPUT BIT 3 16
OUTPUT BIT 2 17
OUTPUT BIT 1 18
MM5450BN/YN
MM5451BN/YN
BRIGHTNESS
19
BRIGHTNESS
19
CONTROL
CONTROL
V
V
DD
20
21 CLOCK IN
20
21 CLOCK IN
DD
Figure 3a, 3b.
M9999-021606
(408) 955-1690
February 2006
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Micrel, Inc.
MM5450/5451
Connection Diagram: Plastic Leaded Chip Carrier
6
5
4
3
2
1
44 43 42 41 40
OUTPUT BIT 13
OUTPUT BIT 12
OUTPUT BIT 11
7
8
9
39 OUTPUT BIT 23
38 OUTPUT BIT 24
37 OUTPUT BIT 25
36 OUTPUT BIT 26
35 OUTPUT BIT 27
34 NC
OUTPUT BIT 10 10
OUTPUT BIT 9 11
NC 12
MM5450BV/YV
OUTPUT BIT 8 13
OUTPUT BIT 7 14
OUTPUT BIT 6 15
OUTPUT BIT 5 16
OUTPUT BIT 4 17
33 OUTPUT BIT 28
32 OUTPUT BIT 29
31 OUTPUT BIT 30
30 OUTPUT BIT 31
29 OUTPUT BIT 32
18 19 20 21 22 23 24 25 26 27 28
6
5
4
3
2
1
44 43 42 41 40
OUTPUT BIT 13
OUTPUT BIT 12
OUTPUT BIT 11
7
8
9
39 OUTPUT BIT 23
38 OUTPUT BIT 24
37 OUTPUT BIT 25
36 OUTPUT BIT 26
35 OUTPUT BIT 27
34 NC
OUTPUT BIT 10 10
OUTPUT BIT 9 11
NC 12
MM5451BV/YV
OUTPUT BIT 8 13
OUTPUT BIT 7 14
OUTPUT BIT 6 15
OUTPUT BIT 5 16
OUTPUT BIT 4 17
33 OUTPUT BIT 28
32 OUTPUT BIT 29
31 OUTPUT BIT 30
30 OUTPUT BIT 31
29 OUTPUT BIT 32
18 19 20 21 22 23 24 25 26 27 28
Figure 4a, 4b.
M9999-021606
(408) 955-1690
February 2006
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Micrel, Inc.
MM5450/5451
Absolute Maximum Ratings
Operating Ratings
Voltage (any pin)........................................VSS to VSS + 12V
Power Dissipation
Supply voltage (VDD – VSS).......................... +4.75V to +11V
Ambient Temperature Range (TA) .............–40°C to +85°C
+25°C........................................................................1W
+85°C.................................................................560mW
Junction Temperature (TJ) .......................................+150°C
Storage Temperature (TS).........................–65°C to +150°C
Lead Temperature (soldering, 10sec.).....................+300°C
Electrical Characteristics
4.5V ≤ VDD ≤ 11V, VSS = 0V; TA = 25°C, bold values indicate –40°C ≤ TA ≤ +85°C, unless otherwise noted.
Symbol
Parameter
Condition
Min
Typ
Max
Units
Power Supply Current
–25°C to +85°C, excluding output loads
–40°C to +85°C, excluding output loads
8.5
10
mA
mA
Data Input Voltage
VL
VH
logic-0 level, ±10 µA input bias
logic-1 level, 4.75V ≤ VDD ≤ 5.25V
–0.3
2.2
VDD –2
0.8
VDD
VDD
V
V
V
V
DD > 5.25V
Brightness Control Input Current
Output Sink Current
Note 2
0
0.75
10
mA
µA
segment off, VOUT = 3.0V
segment on, VOUT = 1.8V, Note 3
brightness input = 0µA
brightness input = 100µA
brightness input = 750µA
0
2.0
15
10
4
25
µA
mA
mA
2.7
Brightness Control Input Voltage
Output Matching
input current = 750 µA
Note 1
3.0
4.3
±20
500
V
%
fC
Clock Input Frequency
Clock Input High Time
Clock Input Low Time
Notes 5, 6
kHz
ns
tH
Notes 5, 6
950
950
300
300
100
8
tL
Notes 5, 6
ns
ns
tDS
tDH
tDES
Data Input Setup Time
Data Input Hold Setup Time
Data Enable Input Setup Time
Reset Pad Current
ns
ns
die
8
µA
Notes:
1. Output matching is calculated as the percent variation (IMAX + IMIN) / 2.
2. With a fixed resistor on the brightness input pin, some variation in brightness will occur among devices.
3. See Figures 7, 8 and 9 for recommended operating conditions and limits. Absolute maximum for each output should be limited to 40mA.
4. VOUT should be regulated by user. See Figures 8 and 9 for allowable VOUT vs. IOUT operation.
5. AC input waveform specification for test purpose: tR ≤ 200ns, tF ≤ 20ns, f = 500kHz, 50% ±10% duty cycle.
6. Clock input rise and fall times must not exceed 300ns.
M9999-021606
(408) 955-1690
February 2006
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Micrel, Inc.
MM5450/5451
Functional Description
The MM5450 and MM5451 were designed to drive either
4- or 5-digit alphanumeric LED displays with the added
benefit of requiring minimal interface with the display or
data source.
Figure 5 shows the input data format. A leading “1” is
followed by 35 bits of data. After the 36th had been
transferred, a LOAD signal is generated synchronously
with the clock high state. This loads the 35 bits of data
into the latches. The low side of the clock is used to
generate a RESET signal which clears all shift registers
for the next set of data. All shift registers are static
master-slave, with no clear for the master portion of the
first register, allowing continuous operation.
Data is transferred serially via 2 signals; clock and serial
data. Data transfer without the added inconvenience of
an external load signal is accomplished by using a
format of a leading “1”followed by the allowed 35 data
bits. These 35 data bits are latched after the 36th has
been transferred. This scheme provides non multiplexed,
direct drive to the LED display. Characters currently
displayed (thus, data output) changes only if the serial
data bits differ from those previously transferred.
There must be a complete set of 36 clocks or the shift
registers will not clear.
When the chip first powers ON, an internal power ON
reset signal is generated which resets all registers and
all latches. The START bit and the first clock return the
chip to its normal operation.
The MIC37252 regulator is fully protected from damage
due to fault conditions. Current limiting is provided. This
limiting is linear; output current during overload
conditions is constant. Thermal shutdown disables the
device when the die temperature exceeds the maximum
safe operating temperature. Transient protection allows
device (and load) survival even when the input voltage
spikes above and below nominal. The output structure of
these regulators allows voltages in excess of the desired
output voltage to be applied without reverse current flow.
Figure 3 and 4 show the pinout of the MIC5450 and
MIC5451. Bit 1 is the first bit following the start bit and it
will appear on pin 18. A logical “1” at the input will turn
on the appropriate LED.
Figure 5 shows the timing relationships between data,
clock and /DATA ENABLE. A maximum clock frequency
of 0.5MHz is assumed.
Control of the output current for LED displays provides
for the display brightness. To prevent oscillations, a 1nF
capacitor should be connected to pin 19, brightness
control.
For applications where a lesser number of outputs are
used, it is possible to either increase the current per
output, or operate the part at higher than 1V VOUT. The
following equation can be used for calculations.
The block diagram is shown in Figure 1. For the
MIC5450, the /DATA ENABLE is a metal option and is
used instead of the 35th output. The output current is
typically 20-times greater that the current into pin 19,
which is set by an external variable resistor.
TJ = (VOUT) (ILED) (No. of segments) (124°C/W) + TA
where:
TJ = junction temperature + 150°C max
VOUT = the voltage at the LED driver outputs
There is an external reset connection shown which is
available on unpackaged (die) only. Figure 2 illustrates
the die pad locations for bonding in “chip on board”
applications.
ILED = the LED current
124°C/W = thermal resistance of the package
TA = ambient temperature
The above equation was used to plot Figures 7–9.
M9999-021606
(408) 955-1690
February 2006
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Micrel, Inc.
MM5450/5451
Figure 5.
Figure 6. Input Data Format
M9999-021606
(408) 955-1690
February 2006
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Micrel, Inc.
MM5450/5451
Typical Performance Characteristics
A
J
LED
Figure 8.
Figure 7.
Figure 9.
Typical Applications
7V
RAW DC
LM317
> 9 V
240
1k
5V
I
19
–
5k
LM324
+
2N2907
PIN 19
20
5V
I
=
MM74HC123
10 µS
19
20
Q
19
1K
CD4046
(VCO)
MM5450
1
MM5450
1
Figure 10. Typical Application of Constant Current
Brightness Control
Figure 11. Brightness Control Varying the Duty Cycle
M9999-021606
(408) 955-1690
February 2006
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Micrel, Inc.
MM5450/5451
Typical Applications
LED DISPLAY
AM
FM
34
MM5450
DISPLAY DRIVER
E L E C T R O N I C
TUNING
CONTROLLER
PLL
SYNTHESIZER
KEYBOARD
S T A T I O N D E T E C T , E T C .
Figure 12. Basic Electronically Tuned Radio System
VLED = 3.0V
VLED = 3.0V
VLED
VLED
9–16 2–8, 40 32–39 24–31
MM5450
18 21 22 19
20
1
23 17
CLOCK IN
DATA IN
VDD
BRIGHTNESS
CONTROL
100k
TYP.
Figure 13. Duplexing 8 Digits with One MM5450
M9999-021606
(408) 955-1690
February 2006
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Micrel, Inc.
MM5450/5451
Package Information
40-Pin Plastic DIP (N)
44-Pin PLCC (V)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its
use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2002 Micrel, Incorporated.
M9999-021606
(408) 955-1690
February 2006
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