CY7C245A-45WMB Cypress Semiconductor Corp, CY7C245A-45WMB Datasheet - Page 3

• Manufacturer Part Number: CY7C245A-45WMB
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C245A-45WMB

• Density: 16Kb
• Organization: 2Kx8
• Access Time (max): 25ns
• Operating Current: 120mA
• Interface Type: Parallel
• Package Type: Windowed CDIP
• Operating Temperature Classification: Military
• Operating Supply Voltage (typ): 5V
• Operating Temp Range: -55C to 125C
• Pin Count: 24
• Mounting: Through Hole
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Not Compliant

AC Test Loads and Waveforms
Switching Characteristics
Operating Modes
The CY7C245A is a CMOS electrically programmable read
only memory organized as 2048 words x 8 bits and is a
pin-for-pin replacement for bipolar TTL fusible link PROMs.
The CY7C245A incorporates a D-type, master-slave register
on chip, reducing the cost and size of pipelined micropro-
grammed systems and applications where accessed PROM
data is stored temporarily in a register. Additional flexibility is
provided with a programmable synchronous (ES) or asynchro-
nous (E) output enable and asynchronous initialization (INIT).
Upon power-up the state of the outputs will depend on the
programmed state of the enable function (ES or E). If the syn-
chronous enable (ES) has been programmed, the register will be in
the set condition causing the outputs (O0 - O7) to be in the OFF or
high-impedance state. If the asynchronous enable (E) is being used,
the outputs will come up in the OFF or high-impedance state only if
the enable (E) input is at a HIGH logic level. Data is read by applying
the memory location to the address inputs (A0 - A10) and a logic
OUTPUT
t
t
t
t
t
t
t
t
t
t
t
t
t
Notes:
Parameter
SA
HA
CO
PWC
SES
HES
DI
RI
PWI
COS
HZC
DOE
HZE
7.
8.
Equivalent to: TH ÉVENIN EQUIVALENT
Applies only when the synchronous (E
Applies only when the asynchronous (E) function is used.
INCLUDING
5V
JIG AND
(a) Normal Load
SCOPE
50 pF
OUTPUT
Address Set-Up to Clock HIGH
Address Hold from Clock HIGH
Clock HIGH to Valid Output
Clock Pulse Width
E
E
Delay from INIT to Valid Output
INIT Recovery to Clock HIGH
INIT Pulse Width
Valid Output from Clock HIGH
Inactive Output from Clock
HIGH
Valid Output from E LOW
Inactive Output from E HIGH
S
S
R1 250
Set-Up to Clock HIGH
Hold from Clock HIGH
[7]
Description
R2
167
100
OUTPUT
Over Operating Range
S
) function is used.
[8]
INCLUDING
5V
[3, 4]
[8]
JIG AND
2.0V
SCOPE
[7]
(b) High Z Load
5 pF
C245A-6
7C245A-15
Min. Max. Min. Max.
15
10
10
10
10
0
5
R1 250
10
15
15
15
12
15
[3, 4]
R2
167
C245A-4
7C245A-18
18
12
10
12
12
3
0
5
LOW to the enable input. The stored data is accessed and loaded into
the master flip-flops of the data register during the address set-up
time. At the next LOW-to-HIGH transition of the clock (CP), data is
transferred to the slave flip-flops, which drive the output buffers, and
the accessed data will appear at the outputs (O0 - O7).
If the asynchronous enable (E) is being used, the outputs may be
disabled at any time by switching the enable to a logic HIGH, and may
be returned to the active state by switching the enable to a logic LOW.
If the synchronous enable (ES) is being used, the outputs will go
to the OFF or high-impedance state upon the next positive clock edge
after the synchronous enable input is switched to a HIGH level. If the
synchronous enable pin is switched to a logic LOW, the subsequent
positive clock edge will return the output to the active state. Following
a positive clock edge, the address and synchronous enable inputs are
free to change since no change in the output will occur until the next
LOW-to-HIGH transition of the clock. This unique feature allows the
CY7C245A decoders and sense amplifiers to access the next
location while previously addressed data remains stable on
the outputs.
12
20
15
15
15
15
Min.
7C245A-35
GND
3.0V
25
15
12
15
15
0
5
5 ns
Max.
12
20
15
15
15
15
7C245AL-25
Min.
7C245A-25
35
20
15
20
20
10%
0
5
ALL INPUT PULSES
90%
Max.
15
20
20
20
20
20
7C245AL-35
Min.
7C245A-35
CY7C245A
45
20
15
20
25
0
5
90%
Max. Unit
10%
25
35
30
30
30
30
5 ns
C245A-5
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns