SER7 Datasheet, PDF (9/11 Pages) ABCircuits – Serial to Seven Segment Controller Expandable to 32 digits

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Serial Input Stream
When a byte is received on the SIN- pin it is placed in the receive buffer. When a carriage return
code (Hex 0D) is received on the SIN- pin, the data in the buffer is translated and moved to the
displays, Afterward the buffer is cleared. The SER7 uses the ADR0-ADR3 pins to determine
which bytes in the buffer to display.
Notes:
Receive buffer size is 32 bytes.
Bit 8 (MSB of the data stream) is ignored.
Line feed characters (Hex 0A) are ignored.
The decimal point (Hex 2E) activates the decimal point output. The decimal point is not displayed
as a separate digit unless required. For instance “1.2” takes two digits to display. “12.” takes
two digits to display in right hand decimal mode and three digits to display in left hand decimal
mode. “.12” takes two digits to display in left hand decimal mode, and three digits to display in
right hand decimal mode. “.1.2.” will take three digits to display.
The data is format is 9600 BPS, 8 bits, 1 stop, no parity.
Absolute Maximum Ratings
Symbol
T_stg
T_a
V_dd
V_io
I_mio
ESD
Description
Storage Temperature
Operating Temperature
V_dd - V_ss Voltage
Input Voltage
Maximum current into any pin
Electrostatic Discharge Voltage
Min
-55
-40
-0.5
V_ss - 0.5
-25
2000
LU
Latch up current
Typical
25
Max
+100
+85
+6.0
V_dd +0.5
+50
200
Units
ºC
ºC
V
V
mA
V
mA
Notes
Human Body Model
ESD
DC Electrical Characteristics
Symbol Description
Min
Typical Max
V_dd
Supply Voltage
2.4
5.25
I_dd
Supply Current
V_oh
High Output Level
V_ol
Low Output Voltage
3
8
V_dd - 1.0
0.75
V_ih
Input High Level
2.1
V_il
Input Low Level
0.8
I_oh
High Level Source Current
10
I_ol
Low Level Sink Current
C_io
Capacitive load
I_il
Input leakage
25
3.5
10
1
R_pu
Pull Up Resistors On Inputs
4
5.6
8
Note 1: Vdd=5VDC, all inputs and outputs open
Note 2 I_oh=10 mA max per pin, 80 mA maximum all pins combined
Note 3 I_ol=25 mA max per pin 150 mA maximum all pins combined
Units
V
mA
V
V
V
V
mA
mA
pF
nA
k?
Notes
Note 1
Note 2
Note 3
Note 2
Note 3
Part Number SER7
Copyright © 2014 ABCircuits. Revised September 2014 Page 9 of 11