- 您现在的位置：买卖IC网 > PDF目录296089 > HC646 (NXP Semiconductors N.V.) Octal bus transceiver/register; 3-state PDF资料下载
参数资料
| 型号： | HC646 |
| 厂商： | NXP Semiconductors N.V. |
| 英文描述： | Octal bus transceiver/register; 3-state |
| 中文描述： | 八路总线收发器/册;三态 |
| 文件页数： | 5/12页 |
| 文件大小： | 91K |
| 代理商： | HC646 |
September 1993
2
Philips Semiconductors
Product specication
Octal bus transceiver/register; 3-state
74HC/HCT646
FEATURES
Independent register for A and B buses
Multiplexed real-time and stored data
Output capability: bus driver
ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT646 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT646 consist of bus transceiver circuits with
3-state outputs, D-type flip-flops, and control circuitry
arranged for multiplexed transmission of data directly from
the internal registers. Data on the “A” or “B” bus will be
clocked into the registers as the appropriate clock
(CPAB and CPBA) goes to a HIGH logic level. Output
enable (OE) and direction (DIR) inputs are provided to
control the transceiver function. In the transceiver mode,
data present at the high-impedance port may be stored in
either the “A” or “B” register, or in both. The select source
inputs (SAB and SBA) can multiplex stored and real-time
(transparent mode) data. The direction (DIR) input
determines which bus will receive data when OE is active
(LOW). In the isolation mode (OE = HIGH), “A” data may
be stored in the “B” register and/or “B” data may be stored
in the “A” register.
When an output function is disabled, the input function is
still enabled and may be used to store and transmit data.
Only one of the two buses, A or B, may be driven at a time.
The “646” is functionally identical to the “648”, but has
non-inverting data paths.
QUICK REFERENCE DATA
GND = 0 V; Tamb =25 °C; tr =tf = 6 ns
Notes
1. CPD is used to determine the dynamic power dissipation (PD in W):
PD =CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
∑ (CL × VCC2 × fo) = sum of outputs
CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC 1.5 V
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
tPHL/ tPLH
propagation delay
An, Bn to Bn, An
CL = 15 pF; VCC =5V
11
13
ns
fmax
maximum clock frequency
69
85
MHz
CI
input capacitance
3.5
pF
CPD
power dissipation capacitance per channel
notes 1 and 2
30
33
pF
相关PDF资料 |
PDF描述 |
|---|---|
| HC7720DW-013.0M-T250 | CRYSTAL OSCILLATOR, CLOCK, 13 MHz, HSCL OUTPUT |
| HCC4017BF | 4000/14000/40000 SERIES, SYN POSITIVE EDGE TRIGGERED 10-BIT UP RING COUNTER, CDIP16 |
| HCMS-2721-S20 | 5X7 DOT MATRIX DISPLAY, YELLOW, 3.8 mm |
| HCMS-2700-S01 | 5X7 DOT MATRIX DISPLAY, STANDARD RED, 3.8 mm |
| HCNR200 | SPECIALTY OPTOELECTRONIC DEVICE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| HC64R8 | 制造商:CONNOR-WINFIELD 制造商全称:Connor-Winfield Corporation 功能描述:14 PIN DIP HCMOS/TTL COMPATIBLE |
| HC64R8R | 制造商:CONNOR-WINFIELD 制造商全称:Connor-Winfield Corporation 功能描述:HCMOS/TTL COMPATIBLE TRI-STATE OUTPUT |
| HC64R8RG | 制造商:CONNOR-WINFIELD 制造商全称:Connor-Winfield Corporation 功能描述:5.0V 14 Pin DIP HCMOS Clock Oscillator |
| HC64R8RG-49.408M | 制造商:CONNOR-WINFIELD 制造商全称:Connor-Winfield Corporation 功能描述:5.0V 14 Pin DIP HCMOS Clock Oscillator |
| HC64RA | 制造商:CONNOR-WINFIELD 制造商全称:Connor-Winfield Corporation 功能描述:14 PIN DIP 3.3V HCMOS TRI-STATE E/D |
发布紧急采购，3分钟左右您将得到回复。