CY7C4425/4205/4215
CY7C4225/4235/4245
Pin Definitions
(continued)
Signal Name
RXI
RXO
RS
OE
V
CC
/SMODE
Description
Read Expansion
Input
Read Expansion
Output
Reset
Output Enable
Synchronous
Almost Empty/
Almost Full Flags
I/O
I
O
I
I
I
Function
Cascaded - Connected to RXO of previous device.
Not Cascaded - Tied to V
SS
.
Cascaded - Connected to RXI of next device.
Resets device to empty condition. A reset is required before an initial read or write
operation after power-up.
When OE is LOW, the FIFO’s data outputs drive the bus to which they are con-
nected. If OE is HIGH, the FIFO’s outputs are in High Z (high-impedance) state.
Dual-Mode Pin
Asynchronous Almost Empty/Almost Full flags - tied to V
CC
.
Synchronous Almost Empty/Almost Full flags - tied to V
SS
.
(Almost Empty synchronized to RCLK, Almost Full synchronized to WCLK.)
Output Current into Outputs (LOW)............................. 20 mA
Static Discharge Voltage ........................................... >2001V
(per MIL-STD-883, Method 3015)
Latch-Up Current ..................................................... >200 mA
Maximum Ratings
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Storage Temperature
....................................−65
°
C to +150
°
C
Ambient Temperature with
Power Applied.................................................−55
°
C to +125
°
C
Supply Voltage to Ground Potential
.................−0.5V
to +7.0V
DC Voltage Applied to Outputs
in High Z State
.....................................................−0.5V
to +7.0V
DC Input Voltage
.................................................−3.0V
to +7.0V
Operating Range
Range
Commercial
Industrial
[1]
Ambient
Temperature
0
°
C to +70
°
C
−40
°
C to +85
°
C
V
CC
5V
±
10%
5V
±
10%
Electrical Characteristics
Over the Operating Range
[2]
7C42X5-10
Parameter
V
OH
V
OL
V
IH [3]
V
IL [3]
I
IX
I
OS[4]
I
OZL
I
OZH
I
CC2[5]
I
SB[6]
Description
Output HIGH Voltage
Output LOW Voltage
Input HIGH Voltage
Input LOW Voltage
Input Leakage
Current
Output Short
Circuit Current
Output OFF,
High Z Current
Operating Current
Standby Current
V
CC
= Max.
V
CC
= Max.,
V
OUT
= GND
OE > V
IH
,
V
SS
< V
O
< V
CC
V
CC
= Max.,
I
OUT
= 0 mA
V
CC
= Max.,
I
OUT
= 0 mA
Com’l
Ind
Com’l
Ind
Test Conditions
V
CC
= Min.,
I
OH
=
−2.0
mA
V
CC
= Min.,
I
OL
= 8.0 mA
2.2
−3.0
−10
−90
−10
+10
45
50
10
15
Min.
2.4
0.4
V
CC
0.8
+10
2.2
−3.0
−10
−90
−10
+10
45
50
10
15
Max.
7C42X5-15
Min.
2.4
0.4
V
CC
0.8
+10
2.2
−3.0
−10
−90
−10
+10
45
50
10
15
Max.
7C42X5-25
Min.
2.4
0.4
V
CC
0.8
+10
2.2
−3.0
−10
−90
−10
+10
45
50
10
15
Max.
7C42X5-35
Min.
2.4
0.4
V
CC
0.8
+10
Max.
Unit
V
V
V
V
µA
mA
µA
mA
mA
mA
mA
Notes:
1. T
A
is the “instant on” case temperature.
2. See the last page of this specification for Group A subgroup testing information.
3. The V
IH
and V
IL
specifications apply for all inputs except WXI, RXI. The WXI, RXI pin is not a TTL input. It is connected to either RXO, WXO of the
previous device or V
SS
.
4. Test no more than one output at a time for not more than one second.
5. Input signals switch from 0V to 3V with a rise/fall time less than 3 ns, clocks and clock enables switch at 20 MHz, while the data inputs switch at 10 MHz.
Outputs are unloaded.
6. All input signals are connected to V
CC
. All outputs are unloaded.
4
CYPRESS [ CYPRESS SEMICONDUCTOR ]
