MM5451BN [MICREL]
LED Display Driver; LED显示驱动器
| 型号： | MM5451BN |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | LED Display Driver |
| 文件： | 总8页 (文件大小：83K) |
| 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
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.
•
•
•
•
•
•
•
•
Continuous brightness control
Serial data input
No load signal requirement
Enable (on MM5450)
Wide power supply operation
TTL compatibility
A single pin controls the LED display brightness by setting a
reference current through a variable resistor connected to
the supply.
34 or 35 outputs, 15mA capability
Alphanumeric capability
Applications
•
•
•
•
Industrial control indicator
Relay driver
Digital clock, thermometer, counter, voltmeter
Instrumentation readouts
Ordering Information
Part Number
MM5450BN
MM5451BN
MM5450BV
MM5451BV
Junction Temp. Range
Package
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
40-pin Plastic DIP
40-pin Plastic DIP
44-pin PLCC
44-pin PLCC
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
REGISTERS
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.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
May 2000
1
MM5450/5451
MM5450/5451
Micrel
Connection Diagram: Die
OUTPUT BIT 12
OUTPUT BIT 11
OUTPUT BIT 10
OUTPUT BIT 9
OUTPUT BIT 8
OUTPUT BIT 7
OUTPUT BIT 24
OUTPUT BIT 25
OUTPUT BIT 26
OUTPUT BIT 27
OUTPUT BIT 28
OUTPUT BIT 29
MM5450/5451
DIE PINOUT
V
V
SS
SS
OUTPUT BIT 6
OUTPUT BIT 5
OUTPUT BIT 4
OUTPUT BIT 30
OUTPUT BIT 31
OUTPUT BIT 32
OUTPUT BIT 3
OUTPUT BIT 33
Note: Die size is 0.106" x 0.099"
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
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
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
BRIGHTNESS
19
BRIGHTNESS
19
CONTROL
CONTROL
V
V
DD
20
21 CLOCK IN
20
DD
Figure 3a, 3b.
MM5450/5451
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May 2000
MM5450/5451
Micrel
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
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
7
8
39 OUTPUT BIT 23
38
37
36
35
34
33
32
31
30
29
9
10
11
NC 12
13
14
15
16
17
18 19 20 21 22
24 25 26 27 28
Figure 4a, 4b.
May 2000
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MM5450/5451
MM5450/5451
Micrel
Absolute Maximum Ratings
Operating Ratings
Voltage (any pin) ...................................... V to V +12V
Supply Voltage (V – V ) ....................... +4.75V to +11V
SS
SS
DD SS
Power Dissipation (P )
Ambient Temperature Range (T ) ............. –40°C to +85°C
A
D
+25°C .........................................................................1W
+85°C ..................................................................560mW
Junction Temperature (T ) ...................................... +150°C
J
Storage Temperature (T ) ....................... –65°C to +150°C
S
Lead Temperature (soldering, 10 sec.) ................... +300°C
Electrical Characteristics
4.5V ≤ VDD ≤ 11V, VSS = 0V; TA = 25°C, bold values indicate –40°C ≤ TA ≤ +85°C; unless 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, ±10µA input bias
logic-1 level, 4.75V ≤ VDD ≤ 5.25V
VDD > 5.25V
–0.3
2.2
VDD–2
0.8
VDD
VDD
V
V
V
Brightness Control Input Current
Output Sink Current
Note 2
0
0.75
10
mA
segment off, VOUT = 3.0V
µA
segment on, VOUT = 1.0V, 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 = 750µA
Note 1
3.0
4.3
±20
500
V
%
fC
Clock Input Frequency
Clock Input High Time
Clock Input Low Time
Data Input Setup Time
Data Input Hold Time
Data Enable Input Setup Time
Reset Pad Current
Notes 5, 6
kHz
ns
ns
ns
ns
ns
µA
tH
Notes 5, 6
950
950
300
300
100
8
tL
Notes 5, 6
tDS
tDH
tDES
die
Note 1: Output matching is calculated as the percent variation (I
+ I ) ÷ 2.
MIN
MAX
Note 2: With a fixed resistor on the brightness input pin, some variation in brightness will occur among devices.
Maximum brightness control input current can be 2mA providing it complies with Note 3 and the junction temperature equation.
Note 3: See Figures 7, 8 and 9 for recommended operating conditions and limits. Absolute maximum for each output should be limited to 40mA.
Note 4: should be regulated by the user. See Figures 8 and 9 for allowable V vs. I operation.
V
OUT
OUT
OUT
Note 5: AC input waveform specification for test purpose: t ≤ 20ns, t ≤ 20ns, f = 500kHz, 50% ±10% duty cycle.
R
F
Note 6: Clock input rise and fall times must not exceed 300ns.
MM5450/5451
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May 2000
MM5450/5451
Micrel
Functional Description
Theremustbeacompletesetof36clocksortheshiftregisters
will not clear.
TheMM5450andMM5451weredesignedtodriveeither4-or
5-digit alphanumeric LED displays with the added benefit of
requiring minimal interface with the display or data source.
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.
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
onlyiftheserialdatabitsdifferfromthosepreviouslytransferred.
Figure3and4showthepin-outoftheMIC5450andMIC5451.
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
TheblockdiagramisshowninFigure1. FortheMIC5450, the
DATA ENABLE is a metal option and is used instead of the
35th output. The output current is typically 20-times greater
thatthecurrentintopin19, whichissetbyanexternalvariable
resistor.
operate the part at higher than 1V VOUT
.
The following
equation can be used for calculations.
TJ = (VOUT) (ILED) (No. of segments) (124°C/W) + TA
Thereisanexternalresetconnectionshownwhichisavailable
on unpackaged (die) only. Figure 2 illustrates the die pad
locations for bonding in “chip on board” applications.
where:
TJ = junction temperature + 150°C max
VOUT = the voltage at the LED driver outputs
ILED = the LED current
Figure5showstheinputdataformat. Aleading“1”isfollowed
by35bitsofdata. Afterthe36thhadbeentransferred,aLOAD
signal is generated synchronously with the clock high state.
124°C/W = thermal resistance of the package
This loads the 35 bits of data into the latches. The low side of TA = ambient temperature
the clock is used to generate a RESET signal which clears all
The above equation was used to plot Figures 7–9.
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.
CLOCK
DATA
300 nS MIN
DATA ENABLE
100 nS MIN
Figure 5.
1
36
37
CLOCK
DATA
START BIT 1
BIT 35 BIT 36
LOAD
(INTERNAL)
RESET
(INTERNAL)
Figure 6. Input Data Format
May 2000
5
MM5450/5451
MM5450/5451
Micrel
Typical Performance Characteristics
110
2.5
TA = 85°C
TA = 85°C
TJ = 150°C (MAX)
VOUT = 1V
100
90
80
70
60
50
40
30
20
10
0
2.0
1.5
VOUT = 1.5V
VOUT = 2V
1.0
0.5
0
0
5
10
15
20
25
30
34
0
4
8
12
16
20
24
28
NUMBER OF SEGMENTS
ILED (mA)
Figure 8.
Figure 7.
1.0
34 SEGMENTS
VOUT = 1V
15 mA/SEGMENT
0.8
0.6
0.4
0.2
SAFE OPERATING
AREA
0
0
20
40
60
80
100
TEMPERATURE (°C)
Figure 9.
Typical Applications
7V
RAW DC
LM317
> 9 V
5V
240
Ω
1k
∆V
I
19
–
20
5k
LM324
+
2N2907
PIN 19
MM74HC123
10 µS
Q
19
CD4046
(VCO)
MM5450
1
5V
∆V
I
=
19
20
1K
MM5450
1
Figure 11. Brightness Control Varying the Duty Cycle
Figure 10. Typical Application of Constant Current
Brightness Control
MM5450/5451
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May 2000
MM5450/5451
Micrel
Typical Applications
LED DISPLAY
AM
FM
34
MM5450
DISPLAY DRIVER
ELECTRONIC
TUNING
CONTROLLER
PLL
SYNTHESIZER
KEYBOARD
STATION DETECT, ETC.
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.
May 2000
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MM5450/5451
MM5450/5451
Micrel
Package Information
.080 NOM
2.040
20
1
.546 ±.010
.100
.030 NOM
105°/90°
.625±.025
21
40
.010
.075
.020 MIN
.150
.018 TYP
.060 ± .002
.125 MIN
.100 TYP
40-Pin Plastic DIP (N)
TOP VIEW
0.015
0.094
0.045
0.045
0.050 TYP
NON-ACCUM
DETAIL A
0.104
0.028
0.018
0.062
TYP
0.030
TYP
0.652
0.690 ±0.005
SIDE VIEW
BOTTOM VIEW
0.045
0.045
0.035 R
±0.010
0.137 TYP
0.062 DIA
0.020 DEEP
x
DETAIL A
x
0.125 DIA 0.005 DEEP
4 PLCS (EJECTOR PIN)
0.020 MIN
0.104
0.172
44-Pin PLCC (V)
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 2000 Micrel Incorporated
MM5450/5451
8
May 2000
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