Read-Only Memory. CDP1837C Datasheet

CDP1837C Memory. Datasheet pdf. Equivalent


GE CDP1837C
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Read-Only Memories (ROMs)
CDP1837C
MA7
MAS
MA5
MA4
MA3
MA2
MAl
MAO
BUS 0
BUS I
BUS2
V5S
24
2 23
3 22
4 21
20
19
18
17
16
10 15
" 14
12 13
TOP VIEW
VDD
TPA
cn
CSI
CS2
MRD
CEO
BUS7
BUS6
BUS5
BUS4
BUS3
TERMINAL ASSIGNMENT
4096-Word X a-Bit Static
Read-Only Memory
Features:
• Interfaces with CDP1800-series microprocessors
(fCIOCk :s 5 MHz) without addItIonal components
• On-chip address latch
• On-chip address decoder provides programmable location within 64K
memory space
• Three-state outputs
The RCA-CDP1837C is a 32768-bit mask-programmable
CMOS read-only memory, organized as 4096 words x 8 bits
and is completely static: no clocks required. It will directly
interface with CDP1800-series microprocessors, having
clock frequencies up to 5 MHz, without additional
components.
The CDP1837C responds to a 16-bit address multiplexed on
8 address lines Address latches are provided on chip for
storing the high byte address data. By mask option, this
ROM can be programmed to operate in any 4096-word
block of 64-K memory space. The polarity of the high
address strobe (TPA), MRD, 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 con~ected
in a daisy chain to control selection of RAM memory in a
microprocessor system without additional components.
The CDP1837C has a recommended operating voltage
range of 4 to 6.5 volts.
The CDP1837C is supplied in 24-lead heremetic dual-In-
Ime side-brazed ceramic packages (D suffix) and 24-lead
dual-in-line plastic packages (E suffix).
RAM
CPU
CDPIBOO
SERIES
IIO
Fig. 1 - Typical CDP1800 Sefles microprocessor system.
92Ct.l~35120
File Number 1381
_________________________________________________________________ 747


CDP1837C Datasheet
Recommendation CDP1837C Datasheet
Part CDP1837C
Description 4096-Word x a-Bit Static Read-Only Memory
Feature CDP1837C; _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Read-Only Memories (ROMs) CDP1837C MA7 MAS MA5 MA4 MA3 .
Manufacture GE
Datasheet
Download CDP1837C Datasheet




GE CDP1837C
Read-Only Memories (ROMs) _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __
CDP1837C
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 ................................................................................... ±10 rnA
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/oC to 200 mW
ForTA =-55 to +100°C (PACKAGE TYPE D) ............................................................................. 500 mW
For TA = +100 to +125°C (PACKAGE TYPE D) .............................................. Derate Linearly at 12 mW/oC to 200 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 .................................................................................................-40 to +85°C
STORAGE TEMPERATURE RANGE (Tstg) ........................................................................... -65 to +150°C
LEAD TEMPERATURE (DURING SOLDERING)
At distance 1116 ± 1132 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
Supply-Voltage Range
Recommended Input Voltage Range
LIMITS
CDP1837C
MIN,
4
Vss
MAX,
6.5
Voo
UNITS
V
MA7
MA6
MA'
MA4
MA3
MA2
MAl
MAO
AOORESS
t LATCH
COI'/TROL
CIRCUIT
3 OE~~gER
4
SELECT
4096, e
MEMORY
ARRAY
23 19
TPA
MRo
o---ll-- VOD
~VSS
OUTPUT
CONTROL
CSI
CS2
OUTPUT
BUFFERS
17
16
15
14
13
"
10
9
BUS 7
BUS 6
BUS 5
BUS 4
BUS 3
BUS 2
BUS I
BUS 0,
OE
92CM-!7228
Fig. 2 - Functional block diagram.
748 _____________________________________________________________



GE CDP1837C
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Read-Only Memories (ROMs)
CDP1837C
STATIC ELECTRICAL CHARACTERISTICS at TA =-40 to +85°C, Voo =5 V ± 5%, except as noted
CHARACTERISTIC
Quiescent Device Current
IDD
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 Current
liN
3-State Output Leakage Current
lOUT
Operating Device Current
IOPERe
Input Capacitance
CIN
Output Capacitance
COUT
'Typical values are for TA = 25°C and nominal VDD.
eOutputs open circuited; cycle time 1 IJ.S.
CONDITIONS
Vo
(V)
-
04
VDD -0.4
-
-
VDD -0.5
VDD -0.5
-
0, VDD
-
-
-
VIN
(V)
0, VDD
0, VDD
0, VDD
0, VDD
0, VDD
-
-
0, VDD
0, VDD
0, VDD
-
-
LIMITS
CDP1837C
Min.
-
08
-0.8
-
VDD -0.1
-
3.5
-
-
-
-
-
Typ.'
5
1.6
-1.6
°
VDD
-
-
-
-
5
5
10
Max.
50
-
-
0.1
-
15
-
±1
±2
10
7.5
15
UNITS
/J.A
mA
V
/J.A
mA
pF
8-BIT BIDIRECTIONAL DATA BUS
II
~ ----
---
AOOR BU-sv" - - -
TPA
ADOR BUS
ROM
No.1
CDPI837C
~ - ----
CEO
CHl'SELECT
SIGNAL
CS
~
II II
----
----
ROM
No.2
CDPI837C
AOOR BUS
~
RAM
-----
CEI CEO
'------T-~
IJlIfl
es
92CS-35122RI
Fig. 3 - Daisy chaining CDPI837C's.
"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-OFFF'6
and ROM No.2 masked-programmed for memory locations
1000'6-1 FFF'6, for addresses from 0000-1 FFF'6, the RAM
would be disabled and one of the ROMs enabled. For
locations above 1FFF'6, the ROM's would be disabled and
the RAM enabled.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _- - - - - - - - - 7 4 9







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