Read-Only Memory. CDP1835C Datasheet

CDP1835C Memory. Datasheet pdf. Equivalent


GE CDP1835C
Read-Only Memories (ROMs) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __
CDP1835C
MA7
MA6
MAS
MA4
MA3
MA2
MAl
MAO
BUSO
BUSI
BUS2
VSS
I 24 Voo
2 23 TPA
3 22 cn
4 21 CSI
5 20 CS2
6 19 MRli
7 18 CEO
8 17 BUS7
• 9 16 BUS6
10 IS BUSS
II 14 BUS4
12 13 BUS3
TOP VIEW
92CS-33188
TERMINAL ASSIGNMENT
CMOS 2048-Word X 8-Bit Static
Read-Only Memory
Features:
• Interfaces with CDP1800-series microprocessors
(fCIOCk::; 5 MHz) without additional components
• On-chip address latch
• On-chip address decoder pro~ides programmable location within 64K
memory space
• Three-state outputs
The RCA-COP1835C is a 16384-bit mask-programmable
CMOS read-only memory, organized as 2048 words x 8 bits
and is completely static: no clocks required. It will directly
interface with COP1800-series microprocessors that have
clock frequencies up to 5 MHz without additional
components.
The COP1835C responds to a 16-bit address multiplexed on
8 address lines. Address latches are provided on-chip to
store the 8 most significant bits of the 16-bit address. By
mask option, this ROM can be programmed to operate in
any 2048-word block of 64K memory space. The polarity of
the high address strobe (TPA), MAD, CEI, CS1, and CS2 are
user mask-programmable.
The Chip-Enable output signal (CEO) is "high" when the
device is selected. Terminals CEO and CEI can be connected
in a daisy chain to control selection of RAM memory in a
microprocessor system without additional components.
The COP1835C has a recommended operating voltage
range of 4 to 6.5 volts.
The COP1835C is supplied in 24-lead heremetic dual-in-
line side-brazed ceramic packages (0 suffix) and 24-lead
dual-in-line plastic packages (E suffix).
RAM
CPU
CDPIBOO
SERIES
I/O
Fig. 1 - Typical CDP1800 Series microprocessor system.
92CM-33192RI
File Number 1267
742 ________________________________________________________________


CDP1835C Datasheet
Recommendation CDP1835C Datasheet
Part CDP1835C
Description CMOS 2048-Word x 8-Bit Static Read-Only Memory
Feature CDP1835C; Read-Only Memories (ROMs) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ CDP1835C MA7 MA6 MAS MA4 MA3 .
Manufacture GE
Datasheet
Download CDP1835C Datasheet




GE CDP1835C
Read-Only Memories (ROMs)
CDP1835C
MAXIMUM RATING, Absolute-Maximum Values:
DC SUPPLY-VOLTAGE RANGE, (Voo)
(All voltages referenced to Vss terminal) ............ .
. .............................. , ..................... , .. -0.5 to +7 V
INPUT VOLTAGE RANGE, ALL INPUTS ........... ..
. ........... -0 5 to Voo +0 5 V
DC INPUT CURRENT, ANY ONE INPUT ............ .
. .......................................................... ~O~
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/'C to 200 mW
For TA = -55 to +100'C (PACKAGE TYPE D)...............
. ........................................................ 500 mW
For TA = +100 to +125'C (PACKAGE TYPE D) ...........
. ..... Derate Linearly at 12 mW/'C to 200 mW
DEVICE DISSIPATION PER OUTPUT TRANSISTOR
For TA = FULL PACKAGE-TEMPERATURE RANGE ....................................................................... 100 mW
OPERATING-TEMPERATURE RANGE (TA)
PACKAGE TYPE 0 ......
.. .......................................................................... -55 to +125'C
PACKAGE TYPE E ................................................................................ , ................-40 to +85'C
STORAGE TEMPERATURE RANGE (T"g) ........................................................................... -65 to +150'C
LEAD TEMPERATURE (DURING SOLDERING)
At distance 1/16 ± 1/32 In (159 ± 0 79 mm) from case for 10 s max ....................................................... +265'C
OPERATING CONDITIONS at TA = FULL PACKAGE-TEMPERATURE RANGE
For maximum reliability, nominal operating conditions should be selected so that operation is always within the
following ranges'
CHARACTERISTIC
DC Operating Voltage Range
Input Voltage Range
LIMITS
CDP1835C
Min.
Max.
4 65
Vss Voo
UNITS
V
MA7
MA.
MAO
MA.
MA3
MA2
MA'
MAO
, ADDRESS
LATCH,
CONTROL
CIRCUIT
3 AND
DECODER
SELECT
'2:048 II 8
MEMORY
ARRAY
I.17
OUTPUT
BUFFERS
"
"
13
10
BUS 7
BUS 6
BUS 5
BUS 4
aus 3
BUS 2
BUS I
BUS 0
TPA
MRO
Q---l.!- V DO
o--!-!-- Vss
OUTPUT
CONTROL
CS'
CS2
DE
92CM-31227
Fig. 2 - Functional block diagram.
_______________________________________________________________ 743



GE CDP1835C
Read-Only Memories (ROMs) _ _ _ _- _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __
CDP1835C
STATIC ELECTRICAL CHARACTERISTICS at TA = -40 to +850 C, VDD = 5 V ± 5%, except al noted
CHARACTERISTIC
Quiescent Device Current
100
Output Low Drive (Sink) Current
IOL
Output High Drive (Source) Current
IOH
Output Voltage Low-Level
VOL
Output Voltage High-Level
VOH
Input Low Voltage
VIL
Input High Voltage
VIH
Input Leakage Current (Any Input)
liN
3-State Output Leakage Current
lOUT
Operating Device Current
lOPER-
Input Capacitance
CIN
Output Capacitance
COUT
'Typical values are for TA = 250 C and nominal Voo.
-Outputs open circuited; cycle time 1 IJS.
CONDITIONS
LIMITS
Vo
(V)
-
0.4
Voo -0.4
-
-
Voo -0.5
Voo -0.5
-
0, Voo
-
-
-
VIN
(V)
0, voo
0, Voo
0, Voo
0, Voo
0, Voo
-
-
0, Voo
0, Voo
0, voo
-
-
CDP1835C
Min.
-
O.B
-O.B
-
Voo -0.1
-
3.5
-
-
-
-
-
Typ.'
5
1.6
-1.6
0
Voo
-
-
-
-
5
5
10
Max.
50
-
-
0.1
-
1.5
-
±1
±2
10
7.5
15
UNITS
IlA
mA
V
IlA
mA
pF
8-BIT BIODIRECTIONAL DATA BUS
/I II
~ ---
TPA
~----
ADDR BUS
--
--
ROM
Nol
CDPI83!5C
ROM
No.2
COPl835C
II
ADQR BUS
~ WE
RAM
SIISA
~ ----
MAil
---
MAil
OE
CEO CEI CEO CE
CHl'SELECT
SIGNAL
CS
CS
92CS-33190R3
a -FIg TypIcal use of daISY chaining feature of the CDPl835C.
"Daisy Chaining" with CEI inputs and CEO outputs is used
to avoid memory conflicts between ROM and RAM in a user
system In the above configuration, If ROM No.1 was
masked-programmed for memory locations 0000-07FF16
and ROM No.2 masked-programmed for memory locations
OB0016-0FFF16, for addresses from 0000-OFFF16, the RAM
would be disabled and one of the ROMs enabled. For
locations above OFFF16, the ROM's would be disabled and
the RAM enabled
744 _______________________________________________________________







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