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Texas Instruments TMS0954

Features

The TMS0954 is a close relative to the TMS0952 with some changes in the ROM code. 

Family Members and Usage

Type Calculator Digits
TMS0952 TI-1200, TI-1250 sign + 8
TMS0954 TI-1260 sign + 8
TMS0972 TI-1200, TI-1250 8 or sign + 7
TMS0974 TI-1270 8 or sign + 7
TMS0975 Little Professor (1976) 8

 

Technical Specification

Item Min Typ Max Unit Comments
VSS   0   V   
VDD   -9.0   V   

Housing

The TMS0954 uses a standard DIP-28 package.

Pin Description

Pin IO Function Pin IO Function
1 O Digit driver 6 28 O Digit driver 5
2 O Digit driver 7 (MSD) 27 O Digit driver 4
3 O Digit driver 8 (sign) 26 O Digit driver 3
4 V Negative Voltage VDD 25 O Digit driver 2
5 I Keymatrix input 1 24 O Digit driver 1
6 I Keymatrix input 2 23 O Digit driver 0
7 I Keymatrix input 3 22 R 6k8-VDD
8 I Keymatrix input 4 21 V Ref voltage
9 I Key or power on reset 20 V Common Voltage 
10 O Segment driver DP 19 I Clock mode
11 O Segment driver G 18 I Clock input
12 O Segment driver F 17 O Segment driver A
13 O Segment driver E 16 O Segment driver B
14 O Segment driver D 15 O Segment driver C

Keyboard Scanmatrix

The keyboards of the TI-1260 consist of a x/y-matrix connected to six segment-driver outputs and the keymatrix inputs K1 to K4. The Power on reset is not connected to any key.

  K1 K2 K3 K4
Seg. DP C g kg
Seg. F MR M+ % :
Seg. E 7 8 9 *
Seg. D 4 5 6 -
Seg. C 1 2 3 +
Seg. B CE 0 . =

Display

The TI-1260 based on the TMS0954 uses a 9-digit LED-display with common cathode architecture. One typical display is the LED-stick 233.

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

Joerg Woerner, February 02, 2001. No reprints without written permission.