DATAMATH CALCULATOR MUSEUM

Texas Instruments SN75493 Segment Driver Chip aka SN27422, SN27915

• Features

The SN75493 provides the same basic function as the SN75491 but with some key differences:

• Operates from lower V_CC voltages, as low as 3.2 V
• An enable input is provided to allow display blanking

The SN75493 is preferred on designs running on 3 batteries and is typically found in early designs with additional segment drivers (TMS0120)

QUICK-LINK to Display Drivers.

• Family Members and Applications

SR-10 and other early LED calculators

• Technical Specifications

Item Min Typ Max Unit Comments

V_CC 3.2 7.2 8.8 V

V_SS 6.5 7.2 8.8 V

I_L -8 -13 mA V_I=6.5 V, V_O=2.2 V, R_L=50 Ohm

I_L -0.1 mA Output Leakage Current

V_I-V_D 10 V

• Technology

The SN75493 was manufactured in a 10 um metal gate Bipolar process (metal width = 0.4 mil / 10 um, metal spacing = 0.4 mil / 10 um).

The die size of the SN75493 is approximately tbd mils * tbd mils / tbd mm * tbd mm.

• Packaging

The SN75493 uses a standard 0.3” wide 16-pin DIP (Dual In-line Package with a 0.1” / 2.54 mm lead pitch).

• Pin Configuration

Pin IO Function Pin IO Function

1 V V_SS 16 V V_CC

2 I Current set 1 15 I Current set 4

3 O Segment output 1 14 O Segment output 4

4 I Segment input 1 13 I Segment input 4

5 I Segment input 2 12 I Segment input 3

6 O Segment output 2 11 O Segment output 3

7 I Current set 2 10 I Current set 3

8 V GND 9 I Enable drivers

If you have additions to the above datasheet please email: joerg@datamath.org.

Item	Min	Typ	Max	Unit	Comments
V_CC	3.2	7.2	8.8	V
V_SS	6.5	7.2	8.8	V
I_L	-8	-13		mA	V_I=6.5 V, V_O=2.2 V, R_L=50 Ohm
I_L			-0.1	mA	Output Leakage Current
V_I-V_D			10	V

Pin	IO	Function	Pin	IO	Function
1	V	V_SS	16	V	V_CC
2	I	Current set 1	15	I	Current set 4
3	O	Segment output 1	14	O	Segment output 4
4	I	Segment input 1	13	I	Segment input 4
5	I	Segment input 2	12	I	Segment input 3
6	O	Segment output 2	11	O	Segment output 3
7	I	Current set 2	10	I	Current set 3
8	V	GND	9	I	Enable drivers