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PDF SCANH162512SM Data sheet ( Hoja de datos )
| Número de pieza | SCANH162512SM | |
| Descripción | Low Voltage Universal 16-bit IEEE 1149.1 Bus Transceiver with TRI-STATE Outputs | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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August 2002
SCAN16512
Low Voltage Universal 16-bit IEEE 1149.1 Bus
Transceiver with TRI-STATE Outputs
General Description
The SCAN16512 is a high speed, low-power universal bus
transceiver featuring data inputs organized into two 8-bit
bytes with output enable and latch enable control signals.
This function is configurable as a D-type Latch or Flip-Flop,
and can operate in transparent, latched, or clocked mode.
This device is compliant with IEEE 1149.1 Standard Test
Access Port and Boundary Scan Architecture with the incor-
poration of the defined boundary-scan test logic and test
access port consisting of Test Data Input (TDI), Test Data
Out (TDO), Test Mode Select (TMS), Test Clock (TCK), and
Test Reset (TRST).
Features
n IEEE 1149.1 (JTAG) Compliant
n 2.7V to 3.6V VCC Operation
n TRI-STATE outputs for bus-oriented applications
n Dual byte-wide data for bus applications
n Power down high Impedance inputs and outputs
n Optional Bus Hold on data inputs eliminates the need
for external pullup/pulldown resistors (SCANH16512,
SCANH162512 versions)
n Optional 25Ω series resistors in outputs to minimize
noise and eliminate termination resistors (SCAN162512,
SCANH162512 versions)
n Supports live insertion/withdrawal
n Includes CLAMP and HIGHZ instructions
Block Diagram
© 2002 National Semiconductor Corporation DS200266
20026602
www.national.com
1 page  
DC Electrical Characteristics (Continued)
Symbol
Parameter
VCC
(V)
Maximum Low Output Voltage
A and B Ports: SCAN162512 and
SCANH162512 Options (25Ω
series resistor options)
2.7
3.0
IIN
Maximum Input Leakage Current
3.6
Industrial
TA = −40˚C to +85˚C
Min Max
0.4
0.6
±5.0
Units
Conditions
V VIN = VIL or VIH,
IOL = 4mA
V VIN = VIL or VIH,
IOL = 12mA
µA VI = VCC, GND
IILR Input Low Current
3.6
IOZ
Maximum I/O Leakage Current
3.6
II(HOLD)
VIKL
IOFF
ICC
ICCt
Bus Hold Input Minimum Drive
Hold Current (Note 4)
Input Clamp Diode Voltage
Power-off Leakage Current
Maximum Quiescent Supply
Current
Maximum ICC Per Input
Note 4: Applies to devices with Bus Hold feature only.
2.7
3.6
2.7
0.0
3.6
3.6
±75
-200
±5.0
±625
-1.5
±10.0
20
0.5
µA VIN = GND
VI (OE) = VIL, VIH
µA VI = VCC, GND
VO = VCC, GND
µA VI = 0.8V or 2.0V
VI = 0 to 3.6V
V IIN = -18mA
µA VO = VCC, GND
µA
mA VI = VCC–0.6V
Noise Specifications
Applies to SCAN16512 and SCANH16512 options, CL = 30pF, RL = 500Ω to GND
Symbol
Parameter
VCC
(V)
VOLP
VOLV
VOHP
VOHV
Quiet Output Maximum Dynamic VOL
(Note 5)
Quiet Output Minimum Dynamic VOL
(Note 5)
Quiet Output Maximum Dynamic VOH
(Note 6)
Quiet Output Minimum Dynamic VOH
(Note 6)
3.3
3.3
3.3
3.3
Industrial
TA = 25˚C
Typical Limits
1.2
-1.5
VOH + 0.9
VOH - 1.5
Units
V
V
V
V
5 www.national.com
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SCANH162512SM.PDF ] | |
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