Keyboard Encoder. CDP1871AC Datasheet

CDP1871AC Encoder. Datasheet pdf. Equivalent


GE CDP1871AC
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 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


CDP1871AC Datasheet
Recommendation CDP1871AC Datasheet
Part CDP1871AC
Description CMOS Keyboard Encoder
Feature CDP1871AC; _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ CMOS Peripherals CDP1871A,CDP1871AC ~VDD , " t .
Manufacture GE
Datasheet
Download CDP1871AC Datasheet




GE CDP1871AC
CMOS PerlpheraI8 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __
CDP1871 A, CDP1871 AC
MAXIMUM RATINGS, Absolute-Maximum Values:
DC SUPPLY-VOLTAGE RANGE, (Voo)
(Voltage referenced to Vss terminal)
CDP1871 A ..........•.....•••.........................•.......••••....•.............•.•.......•.. -0.5 to +11 V
CDP1871AC ••..............•.....................•.....•..•...........••...•..•.•......•.......... -0.5 to +7 V
INPUT VOLTAGE RANGE, ALL INPUTS ••••.••...•...............•.......•...........•.........•.. -0.5 to Voo +0.5 V
DC INPUT CURRENT, ANY ONE INPUT ...............•••••..•••.•......•...•.....•.........•.............• ±10 mA
POWER DISSIPATION PER PACKAGE (Po):
For TA = -40 to +60°C (PACKAGE TYPE E) .........•....•....••.•••..•......•••..•.••..••............... 500 mW
For TA= +60 to +85° C (PACKAGE TYPE E) ....•....•..•••••••.•......•.... Derate Linearly at 12 mW/o C to 200 mW
ForTA=-55 to +100°C (PACKAGE TYPE D) ..........•.....................................•......•••.•. 500mW
For TA = +100 to +125°C (PACKAGE TYPE D) ..........•.......•........... Derate Linearly at 12 mW/oC to 200 mW
For TA = -40)0 +85°C (PACKAGE TYPE 0)· ............................................................. 500 mW
DEVICE DISSIPATION PER OUTPUT TRANSISTOR
For TA = FULL PACKAGE-TEMPERATURE RANGE .•...•••...•.•........•.•.......•...................... 100 mW
OPERATING-TEMPERATURE RANGE (TA):
PACKAGE TYPE D .•.......•.•.........................•....••.....•...........•.•.•••.••.•...•.. -55 to +125°C
PACKAGE TYPE E and 0 .......................................................................... -40 to +85°C
STORAGE-TEMPERATURE RANGE (T...) ............•............•.•••..•.•.....••••..••.•........... -65 to +150°C
LEAD TEMPERATURE (DURING SOLDERING):
At distance 1/16 ± 1/32 In. (1.59 ± 0.79 mm) from case for 10 s maximum ................•.••........•......• +265°C
• Printed-circuit board mount: 57 mm x 57 mm minimum area x 1.6 mm thick G10 epoxy glass, or equivalent.
RECOMMENDED OPERATING CONDITIONS at TA = -40 to +85° C
For maximum reliability, operating conditions should be selected so that operation is always within the following ranges:
LIMITS
CDP1871AD
CDP1871ACD
UNITS
CHARACTERISTIC
Voo CDP1871AE
CDP1871ACE
(V)
MIN.
MAX.
MIN.
MAX.
Supply-Voltage Range
Recommended Input Voltage Range
4 10.5 ~ 6.5
Vss Voo Vss Voo
V
V
Clock Input Frequency, TPB
5 DC 0.4 DC 0.4
(Keyboard Capacitance = 200 pF) fCl 10
DC 0.8
-
- MHz
CSt 1'\---'"'--'"
CS2
CS3
TPB M · - - - - . t
~,,-=8USO
VOO
RX OEBOUNCE
VOO-@
vss-@
iiA~_----1
ffi(3$o---;
011 ALPHA SHIFT CONTROL
92CM·34&22
418 _________________________________________________________________



GE CDP1871AC
_-.-_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ CMOS Peripherals
CDP1871 A, CDP1871 AC
STATIC ELECTRICAL CHARACTERISTIC at T. = -40 to +85°C. except as noted
CHARACTERISTIC
Quiescent Device
Current
Output Low Drive (sink) Current
(except debounce and D1-D11)
Debounce
01-011
Output High Drive (Source) Current
Input Low Voltage
(except Debounce)
Input High Voltage
(except Debounce)
Debounce Schmitt Trigger
Input Voltage
Positive Trigger Voltage
Negative Trigger Voltage
Hysteresis
Output Voltage Low Level
Output Voltage High Level
Input Leakage Current
(except 51-58, Shift, Control)
3-State Output Leakage Current
Pull-Down Resistor Value
(51-58, Shift, Control)
Operating Current
=(All-outputs fcc 0.4 MHz
=unloaded) fcc 0.8 MHz
CONDITIONS
Vo VIN
(V) (V)
- 0,5
-100
0,10
0.4 0,5
10L 0.5 0,10
0.4 0,5
10L 0.5 010
0.4 0,5
10L 0.5 0.10
4.6 0,5
10H 9.5 0.10
-0.5,4.5
-V,L 1,9
0.5,4.5 -
-V,H 1,9
Voo
(V)
5
10
5
10
5
10
5
10
5
10
5
10
5
10
0.4 -
Vo 0.5
0.4
VN 0.5
-
-
-
0.4 0,5
VH 0.5 0,10
- 0,5
-VOL
-
0,10
0,5
-VOH
0.10
-
-liN
0,5
0,10
0.5 0,5
louT 0,10 0,10
-
Rpo
-
loper
0.5,4.5 0,5
1,9 0.10
5
10
5
10
5
10
5
10
5
10
5
10
5
10
-
5
10
LIMITS
CDP1871AD
CDP1871ACD
CDP1871AE
CDP1871ACE
MIN. TYP.* MAX. MIN. TYP.* MAX.
- 0.1 50 -
- 1 200 -
1 200
--
-0.5 1
0.5 1 -
12-- - -
0.75 15 -
075 1.5 -
1 2- - - -
- -.05 0.1
.05 0.1
-0.1 0.2 -
-
-
-0.3
-0.75
-
-
-0.6
-1.5
-
-
- -0.3 -0.6
---
-1.5 -
3- -
-
-
1.5
-
3.5 -
7-
- 3.5 -
---
-
-
UNITS
IlA
mA
2.0 3.3 4.0 2.0 3.3 4.0
- -4.0 6.3 8.0 -
0.8 1.8 3.0 0.8 1.8 3.0
-1.9 4.0 6.0
-
-
V
0.3 1.6 2.6 0.3 1.6 2.6
0.7 2.3 4.7 - - -
-0
-0
4.95 5
9.95 10
.05 -
0
-.05 -
- 4.95 5
- --
.05
-
-
-
- - .01 1 - .01 1
- .01 1 - - -
- .01 1 - .02 2 IlA
- .02 2 - - -
III
7 14 24 7 14 24 kO
- -- 0.6
0.6 -
rnA
- -2.7 - - -
"Typical values are for T. = +25° C. and nominal Voo
TERMINAL ASSIGNMENT
:;: ~ ~
~~~:;:~g?~§~~
0 ::iPT& !) .. , 2. , 444' 42 .., 40
06 1
'1 TPB
n liA
CDP1871A
18192021 22n 24211 26 2128
44-Leed Plaatle Chip-Carrier Paekllge ,
_____________________________(_Q_a_uf_flx_) __________________________ 419







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