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74LCX16646MEA 데이터시트 PDF




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부품번호 74LCX16646MEA 기능
기능 Low Voltage 16-Bit Transceiver/Register with 5V Tolerant Inputs and Outputs
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74LCX16646MEA 데이터시트, 핀배열, 회로
February 1994
Revised April 1999
74LCX16646
Low Voltage 16-Bit Transceiver/Register with 5V Tolerant
Inputs and Outputs
General Description
The LCX16646 contains sixteen non-inverting bidirectional
registered bus transceivers with 3-STATE outputs, provid-
ing multiplexed transmission of data directly from the input
bus or from the internal storage registers. Each byte has
separate control inputs which can be shorted together for
full 16-bit operation.The DIR inputs determine the direction
of data flow through the device. The CPAB and CPBA
inputs load data into the registers on the LOW-to-HIGH
transition (see Functional Description).
The LCX16646 is designed for low voltage (2.5V or 3.3V)
VCC applications with capability of interfacing to a 5V signal
environment.
The LCX16646 is fabricated with an advanced CMOS tech-
nology to achieve high speed operation while maintaining
CMOS low power dissipation.
Features
s 5V tolerant inputs and outputs
s 2.3V–3.6V VCC specifications provided
s 5.2 ns tPD max (VCC = 3.3V), 20 µA ICC max
s Power down high impedance inputs and outputs
s Supports live insertion/withdrawal (Note 1)
s ±24 mA Output Drive (VCC = 3.0V)
s Implements patented noise/EMI reduction circuitry
s Latch-up performance exceeds 500 mA
s ESD performance:
Human Body Model > 2000V
Machine Model > 200V
Note 1: To ensure the high-impedance state during power up or down, OE
should be tied to VCC through a pull-up resistor: the minimum value or the
resistor is determined by the current-sourcing capability of the driver.
Ordering Code:
Order Number Package Number
Package Description
74LCX16646MEA
MS56A
56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300” Wide
74LCX16646MTD
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbol
Pin Descriptions
Pin Names
An
Bn
OEn
CPABn, CPBAn
SABn, SBAn
DIRn
Description
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
Output Enable Inputs
Clock Pulse Inputs
Select Inputs
Direction Control Inputs
© 1999 Fairchild Semiconductor Corporation DS012004.prf
www.fairchildsemi.com




74LCX16646MEA pdf, 반도체, 판매, 대치품
Functional Description
In the transceiver mode, data present at the HIGH imped-
ance port may be stored in either the A or B register or
both. The select (SABn, SBAn) controls can multiplex
stored and real-time. The examples shown below demon-
strate the four fundamental bus-management functions
that can be performed.
The direction control (DIRn) determines which bus will
receive data when OEn is LOW. In the isolation mode (OEn
HIGH), A data may be stored in one register and/or B data
may be stored in the other register. When an output func-
tion is disabled, the input function is still enabled and may
be used to store and transmit data. Only one of the two
busses, A or B, may be driven at a time.
Real-Time Transfer
Bus B to Bus A
Real-Time Transfer
Bus A to Bus B
OE DIR CPAB CPBA SAB SBA
LL X
X XL
Transfer Storage
Data to A or B
OE DIR CPAB CPBA SAB SBA
LH X
X LX
Storage
OE DIR CPAB CPBA SAB SBA
L L X H or L X H
L H H or L X H X
OE DIR CPAB CPBA SAB SBA
L H
X LX
L X X
XL
H X
X XX
H X X
XX
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74LCX16646MEA 전자부품, 판매, 대치품
AC LOADING and WAVEFORMS Generic for LCX Family
FIGURE 1. AC Test Circuit (CL includes probe and jig capacitance)
Test
tPLH, tPHL
tPZL, tPLZ
tPZH,tPHZ
Switch
Open
6V at VCC = 3.3 ± 0.3V
VCC x 2 at VCC = 2.5 ± 0.2V
GND
Waveform for Inverting and Non-Inverting Functions
3-STATE Output High Enable and
Disable Times for Logic
Propagation Delay. Pulse Width and trec Waveforms
Setup Time, Hold Time and Recovery Time for Logic
3-STATE Output Low Enable and
Disable Times for Logic
trise and tfall
FIGURE 2. Waveforms
(Input Characteristics; f =1MHz, tR = tF = 3ns)
Symbol
Vmi
Vmo
Vx
Vy
3.3V ± 0.3V
1.5V
1.5V
VOL + 0.3V
VOH 0.3V
VCC
2.7V
1.5V
1.5V
VOL + 0.3V
VOH 0.3V
2.5V ± 0.2V
VCC/2
VCC/2
VOL + 0.15V
VOH 0.15V
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74LCX16646MEA

Low Voltage 16-Bit Transceiver/Register with 5V Tolerant Inputs and Outputs

Fairchild Semiconductor
Fairchild Semiconductor

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