原装nxp逻辑ic 74hc245d

 1. general description
the 74hc245; 74hct245 is a high-speed si-gate cmos device and is pin compatible
with low-power schottky ttl (lsttl).
the 74hc245; 74hct245 is an octal transceiver featuring non-inverting 3-state bus
compatible outputs in both send and receive directions. the 74hc245; 74hct245
features an output enable input (oe) for easy cascading and a send/receive input (dir)
for direction control. oe controls the outputs so that the buses are effectively isolated.
the 74hc245; 74hct245 is similar to the 74hc640; 74hct640 but has true
(non-inverting) outputs.
2. features
n octal bidirectional bus interface
n non-inverting 3-state outputs
n multiple package options
n complies with jedec standard no. 7a
n esd protection:
u hbm eia/jesd22-a114-b exceeds 2000 v
u mm eia/jesd22-a115-a exceeds 200 v
n specified from -40 °c to +85 °c and from -40 °c to +125 °c
3. quick reference data
74hc245; 74hct245
octal bus tranceiver; 3-state
rev. 03 — 31 january 2005 product data sheet
table 1: quick reference data
gnd = 0 v; tamb = 25 °c; tr = tf = 6 ns.
symbol parameter conditions min typ max unit
type 74hc245
tphl, tplh propagation delay
an to bn or bn to an
cl = 15 pf;
vcc = 5 v
- 7 - ns
ci input capacitance - 3.5 - pf
ci/o input/output capacitance - 10 - pf
cpd power dissipation
capacitance per
transceiver
vi = gnd to vcc
[1] - 30 - pf
type 74hct245
tphl, tplh propagation delay
an to bn or bn to an
cl = 15 pf;
vcc = 5 v
- 10 - ns
9397 750 14502 © koninklijke philips electronics n.v. 2005. all rights reserved.
product data sheet rev. 03 — 31 january 2005 2 of 22
philips semiconductors 74hc245; 74hct245
octal bus tranceiver; 3-state
[1] cpd is used to determine the dynamic power dissipation (pd in mw):
pd = cpd ´ vcc
2 ´ fi ´ n + å (cl ´ vcc
2 ´ fo) where:
fi = input frequency in mhz;
fo = output frequency in mhz;
cl = output load capacitance in pf;
vcc = supply voltage in v;
n = number of inputs switching;
å (cl ´ vcc
2 ´ fo) = sum of outputs.
4. ordering information
ci input capacitance - 3.5 - pf
ci/o input/output capacitance - 10 - pf
cpd power dissipation
capacitance per
transceiver
vi = gnd to
vcc - 1.5 v
[1] - 30 - pf
table 1: quick reference data …continued
gnd = 0 v; tamb = 25 °c; tr = tf = 6 ns.
symbol parameter conditions min typ max unit
table 2: ordering information
type number package
temperature range name description version
74hc245n -40 °c to +125 °c dip20 plastic dual in-line package; 20 leads (300 mil) sot146-1
74hc245d -40 °c to +125 °c so20 plastic small outline package; 20 leads;
body width 7.5 mm
sot163-1
74hc245pw -40 °c to +125 °c tssop20 plastic thin shrink small outline package; 20 leads;
body width 4.4 mm
sot360-1
74hc245db -40 °c to +125 °c ssop20 plastic shrink small outline package; 20 leads;
body width 5.3 mm
sot339-1
74hc245bq -40 °c to +125 °c dhvqfn20 plastic dual-in-line compatible thermal enhanced
very thin quad flat package no leads; 20 terminals;
body 2.5 ´ 4.5 ´ 0.85 mm
sot764-1
74hct245n -40 °c to +125 °c dip20 plastic dual in-line package; 20 leads (300 mil) sot146-1
74hct245d -40 °c to +125 °c so20 plastic small outline package; 20 leads;
body width 7.5 mm
sot163-1
74hct245pw -40 °c to +125 °c tssop20 plastic thin shrink small outline package; 20 leads;
body width 4.4 mm
sot360-1
74hct245db -40 °c to +125 °c ssop20 plastic shrink small outline package; 20 leads;
body width 5.3 mm
sot339-1
74hct245bq -40 °c to +125 °c dhvqfn20 plastic dual-in-line compatible thermal enhanced
very thin quad flat package no leads; 20 terminals;
body 2.5 ´ 4.5 ´ 0.85 mm
sot764-1