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GE - CMOS Keyboard Encoder

Numéro de référence CDP1871A
Description CMOS Keyboard Encoder
Fabricant GE 
Logo GE 





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CDP1871A fiche technique
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ CMOS Peripherals
CDP1871A,CDP1871AC
~VDD
, " t SliiFT
J 38 1 CONTROL
4 37t--- ALPHA
3'5f-- DEBOUNCE
06-- 6
" 33 ............. DA
f--32f-- BUS 7
31 BUS (;
3O~BUS"
29>-- BUS 4
2Bf-- BlJS 3
::3::'-"'E"" 26 - BBUUSS2!
~~; 0
19 22 C52
20 21 e5i
TOP VIEW
TERMINAL ASSIGNMENT
CMOS Keyboard Encoder
Features:
• Directly interfaces with COP1BOO-series microprocessors
• Low power dissipation
• 3-state outputs
• Scans and generates code for 53 key ASCII keyboard plus 32 HEX keys
(SPST mechanical contact switches)
• Shift, control, and alpha lock inputs
• RC-controlled debounce circuitry
• Single 4 to 10.5 V supply (COPIB71A); 4 to 6.5 V (COPIB71AC)
• N-key lockout
The RCA-CDP1871A is a keyboard encoder designed to
directly interface between a CDP1800-series micro-
processor and a mechanical keyboard array, providing up
to 53 ASCII coded keys and 32 HEX coded keys, as shown in
the system diagram (Fig. 1).
The keyboard may consist of simple single-pole single-
throw (SPST) mechanical switches. Inputs are provided for
alpha-lock, control, and shift functions, allowing 160 unique
codes. An external R-C input isavailable for user-selectable
debounce times. The N-key lock-out feature prevents
unwanted key codes if two or more keys are pressed
si multaneously.
The CDP1871A and CDP1871AC are functionally identical.
They differ in that the CDP1871A has a recommended
operating voltage range of 4 to 10.5 volts, and the
CDP1871AC has a recommended operating voltage range
of 4 to 6.5 volts. These types are supplied in 40-lead dual-in-
line ceramic packages (D suffix), and 40-lead dual-in-line
plastic packages (E suffix), and 44-lead plastic chip-carrier
packages (Q suffix).
..
...
TP' f---_..,34~TP'
CDP1800- SE'RIES
CPU
CDPIB71A
.-L4V~DD
SHIFT
BUSO - BUS-'
~TROLI
~CONTROL
IALPHA LOCK
'---<>
'
37
ALPHA
92CL-35
Fig. 1 - Typical COP1BOO-series microprocessor system using the COP1871A.
File Number 1374
417

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