IDT72605/IDT72615 CMOS SyncBiFIFO
256 x 18 x 2 and 512 x 18 x 2
COMMERCIAL TEMPERATURE RANGE
PIN DESCRIPTION (Continued)
Symbol
Name
I/O
Description
FFBA
B→A Full Flag
O
When FFBA is LOW, the B→A FIFO is full and further data writes into Port B are inhibited.
When FFBA is HIGH, the FIFO is not full. FFBA is synchronized to CLKB. In bypass mode,
FFBA tells Port B that a message is waiting in Port A’s output register. If FFBA is LOW, a
bypass message is in the register. If FFBA is HIGH, Port A has read the message and another
message can be written into Port B.
BYPB
Port B Bypass
Flag
O
I
This flag informs Port B that the Synchronous BiFIFO is in bypass mode. When BYPB is
LOW, Port A has placed the FIFO into bypass mode. If BYPB is HIGH, the Synchronous
BiFIFO passes data into memory. BYPB is synchronized to CLKB.
RS
Reset
A LOW on this pin will perform a reset of all Synchronous BiFIFO functions.
VCC
GND
Power
Ground
There are three +5V power pins for the PLCC and PGA packages and two for the TQFP.
There are seven ground pins for the PLCC and PGA packages and four for the TQFP.
2704 tbl 02
RECOMMENDED DC
OPERATING CONDITIONS
ABSOLUTE MAXIMUM RATINGS(1)
Symbol
Rating
Com’l.
Mil.
Unit
Symbol
VCC
Parameter
Supply Voltage
Min. Typ. Max. Unit
VTERM Terminal Voltage
with Respect
–0.5 to +7.0 –0.5 to +7.0
V
4.5 5.0
5.5
0
V
V
V
V
GND
VIH
VIL(1)
Supply Voltage
0
0
to Ground
Input High Voltage
Input Low Voltage
2.0
—
—
—
—
0.8
TA
Operating
Temperature
0 to +70
–55 to +125 °C
NOTE:
2704 tbl 04
TBIAS
TSTG
Temperature
Under Bias
–55 to +125 –65 to +135 °C
–55 to +125 –65 to +150 °C
1. 1.5V undershoots are allowed for 10ns once per cycle.
Storage
Temperature
IOUT
DC Output Current
50
50
mA
CAPACITANCE (TA = +25°C, F = 1.0MHz)
NOTE:
2704 tbl 03
Symbol
CIN(2)
Parameter
Conditions
VIN = 0V
Max. Unit
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RAT-
INGS may cause permanent damage to the device. This is a stress rating
onlyandfunctionaloperationofthedeviceattheseoranyotherconditions
abovethoseindicatedintheoperationalsectionsofthisspecificationisnot
implied. Exposure to absolute maximum rating conditions for extended
periods may affect reliability.
Input Capacitance
10
10
pF
COUT(1,2) Output Capacitance
NOTES:
1. With output deselected.
VOUT = 0V
pF
2704 tbl 05
2. Characterized values, not currently tested.
DC ELECTRICAL CHARACTERISTICS
(Commercial: VCC = 5V ± 10%, TA = 0°C to +70°C)
IDT72615L
IDT72605L
Commercial
tCLK = 20, 25, 35, 50ns
Symbol
Parameter
Min.
Typ.
Max.
Unit
(1)
IIL
Input Leakage Current (Any Input)
Output Leakage Current
–1
–10
2.4
—
—
—
—
—
—
1
µA
µA
V
(2)
IOL
10
VOH
VOL
Output Logic "1" Voltage IOUT = –2mA
Output Logic "0" Voltage IOUT = 8mA
Average VCC Power Supply Current
—
0.4
230
V
(3)
ICC
—
mA
2704 tbl 06
NOTES:
1. Measurements with 0.4V ≤ VIN ≤ VCC.
2. OEA, OEB ≥ VIH; 0.4 ≤ VOUT ≤ VCC.
3. Tested with outputs open. Testing frequency f=20MHz
5.18
5
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
