M5481B7 STMicroelectronics, M5481B7 Datasheet - Page 3

• Manufacturer Part Number: M5481B7
• Description: IC LED DISPLAY DRIVER 20-PDIP
• Manufacturer: STMicroelectronics

Specifications of M5481B7

• Display Type: LED
• Configuration: 7 Segment
• Interface: Serial
• Digits Or Characters: 2 Digits
• Current - Supply: 7mA
• Voltage - Supply: 4.5 V ~ 13.2 V
• Operating Temperature: -25°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 20-DIP (0.300", 7.62mm)
• Number Of Digits: 2
• Number Of Segments: 14
• Operating Supply Voltage: 4.5 V to 13.2 V
• Maximum Supply Current: 7 mA
• Maximum Power Dissipation: 1.5 W
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 2. Static Electrical Characteristics
Note: 1. Output matching is calculated as the percent variation from I
FUNCTIONAL DESCRIPTION
The M5481 uses the M5450 die which is packaged
to operate 2-digit alphanumeric displays with min-
imal interface with the display and the data source.
Serial data transfer from the data source to the dis-
play driver is accomplished with 2 signals, serial
data and clock. using a format of a leading “1” fol-
lowed by the 35 data bits allows data transfer with-
out an additional load signal.
The 35 data bits are latched after the 36th bit is
complete, thus providing non-multiplexed, direct
drive to the display. Outputs change only if the se-
rial data bits differ from the previous time. Display
brightness is determined by control of the output
current for LED displays. A 1nF capacitor should
(T
Symbol
amb
V
f
V
clock
I
O(off)
V
DD
V
I
I
I
2. With a fixed resistor on the brightness input some variation in brightness will occur from one device to another.
3. Absolute maximum for each output should be limited to 40mA.
4. The V
DD
O
O
B
B
I
within operating range, V
O
Supply Voltage
Supply Current
Input Voltage Logical "0" Level
Logical "1" Level
Brightness Input Current (note 2)
Brightness Input Voltage (pin 9)
Off State Out. Voltage
Out. Sink Current (note 3)
Segment OFF
Segment ON
Input Clock Frequency
Output Matching (note 1)
voltage should be regulated by the user.
Parameter
DD
= 4.75V to 13.2V, V
V
± 10µA Input Bias
4.75 ≤ V
V
Input Current = 750µA, T
V
V
Brightness In. = 0µA
Brightness In. = 100µA
Brightness In. = 750µA
O
O
DD
DD
= 3V
= 1V (note 4)
= 13.2V
> 5.25
DD
Test Conditions
MAX
≤ 5.25
be connected to brightness control (pin 9) to pre-
vent possible oscillations.
A block diagram is shown on Figure 3. The output
current is typically 20 times greater than the cur-
rent into pin 9, which is set by an external variable
resistor.
The latter is an internal limiting resistor of 400Ω
nominal value.
Figure 4 shows the input data format. A start bit of
logical “1” precedes the 35 bits of data. At the 36th
clock a LOAD is generated synchronously with the
high state of the clock, which loads the 35 bits of
the shift registers into the latches.
SS
+ I
= 0V, unless otherwise specified)
MIN
/2.
amb
= 25°C
V
Min.
- 0.3
DD
4.5
2.2
12
0
3
0
2
0
- 2
Typ.
2,7
15
Max.
13.2
0.75
4.3
13.2
± 20
V
V
0.5
0.8
10
10
25
7
4
DD
DD
M5481
MHz
Unit
V
mA
mA
mA
µA
µA
mA
%
3/10
V
V
V
V
V