CY7C4425/4205/4215
CY7C4225/4235/4245
Pin Definitions (continued)
Signal Name
Description
I/O
Function
Cascaded - Connected to RXO of previous device.
RXI
Read Expansion
Input
I
Not Cascaded - Tied to V
.
SS
RXO
RS
Read Expansion
Output
O
I
Cascaded - Connected to RXI of next device.
Reset
Resets device to empty condition. A reset is required before an initial read or write
operation after power-up.
OE
Output Enable
I
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.
V
/SMODE Synchronous
Almost Empty/
I
Dual-Mode Pin
Asynchronous Almost Empty/Almost Full flags - tied to V
CC
.
CC
Almost Full Flags
Synchronous Almost Empty/Almost Full flags - tied to V
(Almost Empty synchronized to RCLK, Almost Full synchronized to WCLK.)
.
SS
Output Current into Outputs (LOW)............................. 20 mA
Static Discharge Voltage ........................................... >2001V
(per MIL-STD-883, Method 3015)
Maximum Ratings
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Latch-Up Current..................................................... >200 mA
Storage Temperature ....................................−65°C to +150°C
Ambient Temperature with
Power Applied.................................................−55°C to +125°C
Operating Range
Ambient
Supply Voltage to Ground Potential .................−0.5V to +7.0V
Range
Temperature
0°C to +70°C
−40°C to +85°C
V
CC
DC Voltage Applied to Outputs
in High Z State.....................................................−0.5V to +7.0V
Commercial
5V ± 10%
5V ± 10%
[1]
Industrial
DC Input Voltage .................................................−3.0V to +7.0V
Electrical Characteristics Over the Operating Range
[2]
7C42X5-10 7C42X5-15 7C42X5-25 7C42X5-35
Parameter
Description
Test Conditions
Min. Max. Min. Max. Min. Max. Min. Max. Unit
V
Output HIGH Voltage
V
= Min.,
= −2.0 mA
2.4
2.4
2.4
2.4
V
OH
CC
I
OH
V
Output LOW Voltage
V
= Min.,
0.4
0.4
0.4
0.4
V
OL
CC
I
= 8.0 mA
OL
[3]
V
V
Input HIGH Voltage
Input LOW Voltage
2.2
−3.0
−10
V
2.2
−3.0
−10
V
2.2
−3.0
−10
V
2.2
−3.0
−10
V
V
V
IH
[3]
CC
CC
CC
CC
0.8
0.8
0.8
0.8
IL
I
Input Leakage
Current
V
= Max.
= Max.,
+10
+10
+10
+10
µA
IX
CC
[4]
I
Output Short
Circuit Current
V
V
−90
−10
−90
−10
−90
−10
−90
−10
mA
OS
CC
= GND
OUT
I
I
Output OFF,
High Z Current
OE > V ,
V
+10
+10
+10
+10
µA
OZL
OZH
IH
< V < V
SS
O
CC
[5]
I
Operating Current
Standby Current
V
= Max.,
= 0 mA
Com’l
Ind
45
50
10
15
45
50
10
15
45
50
10
15
45
50
10
15
mA
mA
mA
mA
CC2
CC
I
OUT
[6]
I
V
= Max.,
= 0 mA
Com’l
Ind
SB
CC
I
OUT
Notes:
1. TA is the “instant on” case temperature.
2. See the last page of this specification for Group A subgroup testing information.
3. The VIH and VIL 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 VSS
.
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 VCC. All outputs are unloaded.
4