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. TANDY COMPUTER PRODUCTS
SPECIFICATION
NON-ENCODED KEYBOARD MATRIX
1. Scope
This specification covers a keyboard.
2. Electrical Characteristics
2-1
Contact Resistance :
500 Ohm Max.,5Vdc 1mA
2-2
Contact Bounce :
10msec Max. (operating speed at 250 mm/sec)
2-3
Insulation Resistance s
50Mohm Min. at 250Vdc
(between switch contacts)
2-4
Dielectric Withstand Voltage :
250 Vdc for 1 minute (betweem PCB pattern and iron panel)
150 Vdc for 1 minute (between switch contacts)
3. Mechanical Characteristics
3-1
Operating Force s
70g+/-25g
at full stroke
(at center of keycap)
3-2
Plunger Stroke :
\
0.5 mm
! off region
!
3.8mm+/-0.5
!
3-3
Operating Point :
!
! on - off
!
3.8 mm
! switching
!
0.5mm Mim. to full stroke
!
! region
!
i
i
i
3-4
Release Point :
!
/
0.5 mm
!
on region
!
0.5mm Min. to free position
4. Operating Life *
4-1
Life :
10Meg
(10 million operation)
4-2
Contact Resistance :
500ohm Max.
(upto 10 million), 800ohm
(after 10 million)
4-3
Contact Bounce s
10msec Max.
(after 10Meg)
Page 2 of 7
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