米6体育平台手机版

SCLS589B August 2004 – May 2020 SN74LV8154

PRODUCTION DATA.

请参考 PDF 数据表获取器件具体的封装图。

Connect Y0 through Y7 to the data bus.
Connect A, B, and C to lower address bus lines.
Connect G2A, G2B, and G1 to decoded addresses to provide 8 or more unique memory locations.
Connect two pulse sources to CLKA and CLKB inputs. If sources have noise or slow edges then pass the signal through a Schmitt trigger buffer first.
If only one counter is needed, connect the single pulse source to both CLKA and CLKB.
Also connect CLKBEN to RCOA instead of ground.

INPUTS⁽¹⁾						OUTPUT⁽¹⁾	RESULT
G1	G2A	G2B	C	B	A	Yn	RESULT
L	X	X	X	X	X	Z	No action
X	H	X	X	X	X	Z	No action
X	X	H	X	X	X	Z	No action
H	L	L	L	L	L	A lower byte	Read lower byte of counter A storage register
H	L	L	L	L	H	A upper byte	Read upper byte of counter A storage register
H	L	L	L	H	L	B lower byte	Read lower byte of counter B storage register
H	L	L	L	H	H	B upper byte	Read upper byte of counter B storage register
H	L	L	H	L	L	Z	Save counters into storage register after changing any input
H	L	L	H	L	H	Z	Reset both counters to zero
H	L	L	H	H	L	Z	No action
H	L	L	H	H	H	Z	No action

(1) L = low, H = high, X = don't care, Z = high Impedance.