ETC CY74FCT2827ATQC

fax id: 7006
1CY 74FCT2 827 T
CY74FCT2827T
10-Bit Buffer
Features
• Sink current
Source current
• Function and pinout compatible with FCT, F, and
AM29827 logic
• FCT-C speed at 5.0 ns max. (Com’l),
FCT-A speed at 8.0 ns max. (Com’l)
• 25Ω output series resistors to reduce transmission line
reflection noise
• Reduced VOH (typically = 3.3V) versions of equivalent
FCT functions
• Edge-rate control circuitry for significantly improved
noise characteristics
• Power-off disable feature
• ESD > 2000V
• Matched rise and fall times
• Fully compatible with TTL input and output logic levels
• Extended commercial temp. range of –40°C to +85°C
12 mA
15 mA
Functional Description
The FCT2827T 10-bit bus driver provides high-performance
bus interface buffering for wide data/address paths or buses
carrying parity. This 10-bit buffer has NAND-ed output enables for
maximum control flexibility. The FCT2827T is designed for
high-capacitance load drive capability, while providing low-capacitance bus loading at both inputs and outputs. All inputs have clamp
diodes and all outputs are designed for low-capacitance bus loading in the high impedance state. On-chip termination resistors have
been added to the outputs to reduce system noise caused by reflections. The FCT2827T can be used to replace the FCT827T to
reduce noise in an existing design.
The outputs are designed with a power-off disable feature to
allow for live insertion of boards.
Pin Configurations
Logic Block Diagram
SOIC/QSOP
Top View
Y0
D0
Y1
D1
Y2
D2
Y3
D3
Y4
D4
Y5
D5
Y6
Y7
D6
D7
Y8
D8
Y9
D9
OE1
1
24
VCC
D0
2
23
Y0
D1
3
22
Y1
D2
4
21
Y2
D3
5
20
Y3
D4
6
19
Y4
D5
7
18
Y5
D6
8
17
Y6
D7
9
16
Y7
D8
10
15
Y8
D9
11
14
Y9
GND
12
13
OE2
OE1 OE2
FCT2827T–3
FCT2827T–2
Function Table[1]
Inputs
Outputs
OE1
OE2
D
Y
Function
L
L
L
L
L
H
L
H
Transparent
H
X
X
H
X
X
Z
Z
Three-State
Note:
1. H = HIGH Voltage Level. L = LOW Voltage Level. X = Don’t Care.
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134 •
408-943-2600
May 1994 – Revised October 1996
CY74FCT2827T
Maximum Ratings[2, 3]
DC Output Current (Maximum Sink Current/Pin) ...... 120 mA
Power Dissipation.......................................................... 0.5W
(Above which the useful life may be impaired. For user guidelines, not tested.)
Static Discharge Voltage ........................................... >2001V
(per MIL-STD-883, Method 3015)
Storage Temperature ................................. –65°C to +150°C
Ambient Temperature with
Power Applied............................................. –65°C to +135°C
Operating Range
Supply Voltage to Ground Potential ............... –0.5V to +7.0V
Range
DC Input Voltage............................................ –0.5V to +7.0V
Commercial
DC Output Voltage ......................................... –0.5V to +7.0V
Ambient
Temperature
VCC
–40°C to +85°C
5V ± 5%
Electrical Characteristics Over the Operating Range
Parameter
Description
Test Conditions
Min.
Typ.[4]
2.4
3.3
VOH
Output HIGH Voltage
VOL
Output LOW Voltage
VCC = Min., IOH = –15 mA
VCC = Min., IOL = 12 mA
ROUT
Output Resistance
VCC = Min., IOL = 12 mA
VIH
Input HIGH Voltage
VIL
Input LOW Voltage
VH
Hysteresis[5]
All inputs
0.2
VIK
Input Clamp Diode Voltage
VCC = Min., IIN = –18 mA
–0.7
II
Input HIGH Current
IIH
Input HIGH Current
VCC = Max., VIN = VCC
VCC = Max., VIN = 2.7V
IIL
Input LOW Current
IOZH
20
Max.
Unit
V
0.3
0.55
V
25
40
Ω
2.0
V
0.8
V
V
–1.2
V
5
µA
±1
µA
VCC = Max., VIN = 0.5V
±1
µA
Off State HIGH-Level Output
Current
VCC = Max., VOUT = 2.7V
10
µA
IOZL
Off State LOW-Level
Output Current
VCC = Max., VOUT = 0.5V
–10
µA
IOS
Output Short Circuit Current[6]
–225
mA
IOFF
Power-Off Disable
VCC = Max., VOUT = 0.0V
VCC = 0V, VOUT = 4.5V
±1
µA
–60
–120
Capacitance[5]
Parameter
Description
Typ.[4]
Max.
Unit
CIN
Input Capacitance
5
10
pF
COUT
Output Capacitance
9
12
pF
Notes:
2. Unless otherwise noted, these limits are over the operating free-air temperature range.
3. Unused inputs must always be connected to an appropriate logic voltage level, preferably either V CC or ground.
4. Typical values are at VCC=5.0V, TA=+25°C ambient.
5. This parameter is guaranteed but not tested.
6. Not more than one output should be shorted at a time. Duration of short should not exceed one second. The use of high-speed test apparatus and/or sample
and hold techniques are preferable in order to minimize internal chip heating and more accurately reflect operational values. Otherwise prolonged shorting of
a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parametric tests. In any sequence of parameter
tests, IOS tests should be performed last.
2
CY74FCT2827T
Power Supply Characteristics
Parameter
Description
Test Conditions
Typ.[4]
Max.
Unit
ICC
Quiescent Power Supply Current
VCC=Max., VIN ≤ 0.2V,
VIN ≥ VCC-0.2V
0.1
0.2
mA
∆ICC
Quiescent Power Supply Current
(TTL inputs HIGH)
VCC=Max., VIN=3.4V,[7]
f1=0, Outputs Open
0.5
2.0
mA
ICCD
Dynamic Power Supply
Current[8]
VCC=Max., One Input Toggling,
50% Duty Cycle, Outputs Open,
OE1 or OE2=GND,
VIN ≤ 0.2V or VIN ≥ VCC-0.2V
0.06
0.12
mA/
MHz
IC
Total Power Supply Current[9]
VCC=Max.,
50% Duty Cycle, Outputs Open,
One Bit Toggling at f1=10 MHz,
OE1 or OE2=GND,
VIN ≤ 0.2V or VIN ≥ VCC-0.2V
0.7
1.4
mA
VCC=Max.,
50% Duty Cycle, Outputs Open,
One Bit Toggling at f1=10 MHz,
OE1 or OE2=GND,
VIN=3.4V or VIN=GND
1.0
2.4
mA
VCC=Max.,
50% Duty Cycle, Outputs Open,
Ten Bits Toggling at f1=2.5 MHz,
OE1 or OE2=GND,
VIN ≤ 0.2V or VIN ≥ VCC-0.2V
1.6
3.2[10]
mA
VCC=Max., 50% Duty Cycle, Outputs Open,
Ten Bits Toggling at f1=2.5 MHz,
OE1 or OE2=GND,
VIN=3.4V or VIN=GND
4.1
13.2[10]
mA
Notes:
7. Per TTL driven input (VIN=3.4V); all other inputs at VCC or GND.
8. This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
= I QUIESCENT + I INPUTS + I DYNAMIC
9. IC
IC
= I CC+∆ICCDHNT +ICCD(f0/2 + f 1N1)
ICC = Quiescent Current with CMOS input levels
∆ICC = Power Supply Current for a TTL HIGH input
(V IN=3.4V)
DH = Duty Cycle for TTL inputs HIGH
NT = Number of TTL inputs at DH
ICCD = Dynamic Current caused by an input transition pair
(HLH or LHL)
= Clock frequency for registered devices, otherwise zero
f0
= Input signal frequency
f1
N1 = Number of inputs changing at f1
All currents are in milliamps and all frequencies are in megahertz.
10. Values for these conditions are examples of the ICC formula. These limits are guaranteed but not tested.
]
3
CY74FCT2827T
Switching Characteristics Over the Operating Range[11]
CY74FCT2827AT
Param.
Description
CY74FCT2827BT
CY74FCT2827CT
Test Load
Min.
Max.
Min.
Max.
Min.
Max.
Unit
Fig.
No.[12]
tPLH
tPHL
Propagation Delay
D to Y
CL=50 pF
RL=500Ω
1.5
8.0
1.5
5.0
1.5
4.4
ns
1, 3
tPLH
tPHL
Propagation Delay
D to Y[5]
CL=300 pF
RL=500Ω
1.5
15.0
1.5
13.0
1.5
10.0
ns
1, 3
tPZH
tPZL
Output Enable Time
OE to Y
CL=50 pF
RL=500Ω
1.5
12.0
1.5
8.0
1.5
7.0
ns
1, 7, 8
tPZH
tPZL
Output Enable Time
OE to Y[5]
CL=300 pF
RL=500Ω
1.5
23.0
1.5
15.0
1.5
14.0
ns
1, 7, 8
tPHZ
tPHL
Output Disable Time
OE to Y[5]
CL=5 pF
RL=500Ω
1.5
9.0
1.5
6.0
1.5
5.7
ns
1, 7, 8
tPHZ
tPHL
Output Disable Time
OE to Y
CL=50 pF
RL=500Ω
1.5
9.0
1.5
7.0
1.5
6.0
ns
1, 7, 8
Ordering Information
Speed
(ns)
4.4
5.0
8.0
Ordering Code
Package
Name
Package Type
CY74FCT2827CTQC
Q13
24-Lead (150-Mil) QSOP
CY74FCT2827CTSOC
S13
24-Lead (300-Mil) Molded SOIC
CY74FCT2827BTQC
Q13
24-Lead (150-Mil) QSOP
CY74FCT2827BTSOC
S13
24-Lead (300-Mil) Molded SOIC
CY74FCT2827ATQC
Q13
24-Lead (150-Mil) QSOP
CY74FCT2827CTSOC
S13
24-Lead (300-Mil) Molded SOIC
Note:
11. Minimum limits are guaranteed but not tested on Propagation Delays.
12. See “Parameter Measurement Information” in the General Information section.
Document #: 38-00347-A
4
Operating
Range
Commercial
Commercial
Commercial
CY74FCT2827T
Package Diagrams
24-Lead Quarter Size Outline Q13
24-Lead (300-Mil) Molded SOIC S13
© Cypress Semiconductor Corporation, 1996. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use
of any circuitry other than circuitry embodied in a Cypress Semiconductor product. Nor does it convey or imply any license under patent or other rights. Cypress Semiconductor does not authorize
its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress
Semiconductor products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress Semiconductor against all charges.